Which nerve innervates the quadriceps femoris?
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Femoral nerve
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Which nerve innervates the quadriceps femoris?
Femoral nerve
What is the structure that supports the head of the femur?
The neck of the femur supports the head.
How is body weight transferred from the vertebral column to the femurs?
Body weight is transferred from the vertebral column through the sacroiliac joints to the pelvic girdle and from the pelvic girdle through the hip joints to the femurs.
What happens to the lower limb during development?
The lower limb undergoes medial rotation through 180º, causing the original dorsal or extensor surface to become anterior and the ventral or flexor surface to become posterior.
What is the role of the fibula in body weight transmission?
The fibula does not take part in the transmission of body weight.
What are the two large, blunt elevations located where the neck of the femur joins the shaft?
The trochanters.
What is the natural tendency of the patella regarding dislocation?
The natural tendency of the patella is to dislocate laterally due to the upward and lateral pull by the Quadriceps.
Which spinal segments regulate flexion, adduction, and medial rotation?
L2 and L3 spinal segments
Where is the gluteal region located?
The gluteal region or buttock lies behind the pelvis and hip, above the posterior compartment of the thigh.
What is the primary function of the tensor fascia lata?
Abducts the hip joint and maintains the extended position of the knee joint through the iliotibial tract.
What are the lateral rotators of the thigh at the hip joint commonly referred to as?
Triceps of hip
Which arteries supply blood to the head and neck of the femur?
Medial and lateral circumflex femoral arteries, which are branches from the profunda femoris artery.
What anatomical feature contributes to the stability of the hip joint by providing depth?
The depth of the acetabulum contributes to the stability of the hip joint.
What is the function of the ilio-femoral ligament?
It is the strongest ligament that prevents hyperextension of the hip joint.
What is the function of the obturator externus muscle?
Lateral rotator of the thigh.
Which muscles of the leg do not attach to the fibula?
The muscles that do not attach to the fibula are Tibialis anterior, Gastrocnemius, and Plantaris.
What is the intertrochanteric line?
It is a roughened ridge running from the greater to the lesser trochanter.
What are the factors that prevent lateral dislocation of the patella?
Which spinal segments are responsible for extension, abduction, and lateral rotation?
L4 and L5 spinal segments
What are the two main components that articulate in the hip joint?
The hemispherical head of the femur and the cup-shaped acetabulum of the hip bone.
Which ligaments strengthen the capsule of the hip joint?
The iliofemoral, pubofemoral, and ischiofemoral ligaments strengthen the capsule of the hip joint.
What is the role of the obturator artery in the blood supply of the hip joint?
The obturator artery supplies blood to the head of the femur.
What does the pubo-femoral ligament prevent?
It prevents overabduction of the hip joint.
Which nerve innervates the tensor fascia lata?
Superior gluteal nerve.
What is the role of the ACL in the knee joint?
The ACL serves as a pivot for rotatory movements of the knee.
What structure deepens the acetabulum?
The acetabular labrum, which is made up of fibrocartilage.
Which arteries are involved in the trochanteric and cruciate anastomosis?
The superior and inferior gluteal arteries.
How do surrounding muscles contribute to the stability of the hip joint?
The strength of the surrounding muscles contributes to the stability of the hip joint.
What is the function of the synovial membrane in the knee joint?
The synovial membrane lines the capsule and is attached to the articular surface.
What are the functions of the ischio-femoral ligament?
It prevents hyperextension of the hip joint and limits medial rotation of the hip.
What is the line of axis of the foot?
The line of axis of the foot passes through the second toe.
How is weight transferred from the knee joint to the ankle joint?
Weight is transferred from the knee joint to the ankle joint by the tibia.
When is the ACL taut?
The ACL is taut during flexion of the knee.
What is the primary function of the Sartorius muscle?
It flexes both the hip and knee joints.
What is the function of the capsule in the hip joint?
The capsule encloses the joint and is attached to the acetabular labrum medially and the intertrochanteric line and posterior aspect of the neck of the femur laterally.
What is the commonest site for intramuscular injection?
Gluteal region
What are bursae and how are they formed in relation to the synovial membrane?
Bursae are outpocketings of the synovial membrane.
What factors related to the femur affect the stability of the hip joint?
The length and obliquity of the neck of the femur affect the stability of the hip joint.
What is the primary extensor of the knee?
Quadriceps femoris
Does the fibula articulate with the femur?
No, the fibula does not articulate with the femur and does not bear weight.
What is the angle of inclination in the proximal femur?
The angle of inclination refers to the bending of the proximal femur (L-shaped) where the long axis of the head and neck projects superomedially at an angle to the obliquely oriented shaft.
What is the movement of the hip joint that decreases the angle between the thigh and the pelvis?
Flexion
What can cause the ACL to tear?
The ACL may tear subsequent to the rupture of the TCL.
What are the two layers of the hip joint capsule?
The outer longitudinal (retinacular) layer and the inner circular fibres.
What are the main components of the proximal end of the femur?
The proximal end of the femur consists of a head, neck, and two trochanters (greater and lesser).
Name three bursae associated with the knee joint.
Suprapatellar bursa, Semimembranous bursa, Popliteal bursa.
How does the Sartorius muscle affect the position of the lower limb when sitting?
It abducts the thigh laterally to bring the lower limb into a sitting position.
What condition can result from sciatic injuries?
Foot drop
Who are the chief flexors of the knee joint?
The chief flexors of the knee joint include the hamstring muscles.
How does the angle of inclination affect the mobility of the femur at the hip joint?
The angle of inclination allows greater mobility of the femur at the hip joint by placing the head and neck more perpendicular to the acetabulum.
To which bone is the weight transferred at the ankle?
At the ankle, the weight is transferred to the talus.
What type of joint is the hip joint?
The hip joint is a strong and stable multiaxial ball and socket type of synovial joint.
What type of joint is the knee joint classified as?
Modified hinge joint
What is the movement of the hip joint that increases the angle between the thigh and the pelvis?
Extension
What are the three primary bones that form each hip bone?
Ilium, ischium, and pubis.
What is the 'unhappy triad' in knee injuries?
The 'unhappy triad' refers to a combination of injuries including the ACL tear, TCL rupture, and damage to the meniscus.
What covers the head of the femur?
The head of the femur is covered with articular cartilage, except for a medially placed depression or pit, the fovea for the ligament of the head.
What is the function of the ligamentum patellae?
The ligamentum patellae serves to connect the patella to the tibia and helps in stabilizing the knee joint.
What does Trendelenburg's sign indicate?
It indicates the integrity of the hip abductors.
Why is the angle of inclination advantageous for bipedal walking?
It is advantageous for bipedal walking because it enhances the mobility of the femur at the hip joint.
What are the hip extensors during walking on flat ground?
The hip extensors during walking on flat ground primarily include the gluteus maximus and hamstrings.
What are the components of the hip joint?
The femoral head acts as the ball, and the acetabulum serves as the socket.
What role does the talus play in the foot's structure?
The talus is the keystone of a longitudinal arch formed by the tarsal and metatarsal bones, distributing weight evenly between the heel and the forefoot when standing.
What is the movement of the hip joint that moves the thigh away from the midline of the body?
Abduction
Which muscles are the main abductors of the hip joint?
The main abductors of the hip joint are the gluteus medius and gluteus minimus.
What is the origin of the anterior cruciate ligament (ACL)?
The ACL arises from the anterior intercondylar area of the tibia, just posterior to the attachment of the medial meniscus.
What are the two types of articulations involved in the knee joint?
Lateral and medial femorotibial condyles (condylar type) and femoropatellar articulation (saddle type)
What is the primary function of the human lower limb?
The human lower limb is built for support and propulsion.
Which surfaces of the neck of the femur are intracapsular?
The anterior surface of the neck of the femur is completely intracapsular, whereas only the medial half of its posterior surface is intracapsular.
What is a common cause of dislocation of the head of the femur?
A head-on collision during an automobile accident.
Which part of the hip bone is the largest and contributes to the acetabulum?
The ilium.
What is inversion at the subtalar joint?
Inversion is the movement in which the medial border of the foot is raised so that the sole faces medially.
What is the primary function of the femur?
The primary function of the femur is to support the weight of the body and allow for movement of the lower limb.
What is the lateral (fibular) collateral ligament?
The lateral (fibular) collateral ligament is a ligament that provides stability to the outer side of the knee joint.
What is a potential drawback of the angle of inclination?
A potential drawback is that it imposes considerable strain on the neck of the femur.
How do the femurs of females compare to those of males?
The femurs of females are slightly more oblique than those of males, reflecting the greater width of their pelves.
What is the primary function of the hip joint?
The hip joint is designed for stability over a wide range of movement.
What is the movement of the hip joint that brings the thigh closer to the midline of the body?
Adduction
Where does the anterior cruciate ligament (ACL) attach?
The ACL extends superiorly, posteriorly, and laterally to attach to the posterior part of the medial surface of the lateral condyle of the femur.
Which muscles are primarily responsible for hip abduction?
The gluteus medius and gluteus minimus are primarily responsible for hip abduction.
How does the action of hip extensors affect hip flexion when the knee is extended?
The action of hip extensors restricts the range of hip flexion when the knee is extended, such as during toe touching.
What is the primary function of the gluteus maximus?
The gluteus maximus is the chief extensor of the hip joint during standing up from a sitting position and climbing upstairs.
Where do the two hip bones articulate with one another?
The two hip bones articulate in front at the pubic symphysis.
What nerve innervates the main abductors of the hip joint?
The main abductors of the hip joint are innervated by the Superior gluteal nerve.
Which nerves are responsible for the innervation of the knee joint?
Femoral, Tibial, common peroneal, and Obturator nerves
What type of dislocation occurs when the femoral head is forced out of the acetabulum?
Posterior dislocation of the hip joint.
What is the acetabulum?
A cup-like cavity (socket) on the lateral aspect of the hip bone for articulation with the head of the femur.
What is an ACL injury?
An ACL injury refers to a rupture of the anterior cruciate ligament, which is one of the most common knee injuries.
What are the main parts of the femur?
The main parts of the femur include the head, neck, greater and lesser trochanters, and the shaft.
What is dorsiflexion and which muscle primarily performs it?
Dorsiflexion is the movement of the foot upwards towards the shin, primarily performed by the Tibialis anterior.
What is the origin of the posterior cruciate ligament (PCL)?
The PCL arises from the posterior intercondylar area of the tibia.
What role does the medial (tibial) collateral ligament play?
The medial (tibial) collateral ligament stabilizes the inner side of the knee joint and prevents excessive side-to-side movement.
What is eversion at the subtalar joint?
Eversion is the movement in which the lateral border of the foot is raised so that the sole faces laterally.
What are the primary functions of the muscles in the anterior compartment of the thigh?
The primary functions are flexion of the hip and extension of the knee.
How does the weight of the upper body affect the hip joint during standing?
During standing, the entire weight of the upper body is transmitted through the 2 hip bones to the head and neck of the 2 femurs.
What is the movement of the hip joint that rotates the thigh towards the midline?
Medial rotation
What is the blood supply status of the anterior cruciate ligament (ACL)?
The ACL has a relatively poor blood supply.
Which nerve innervates the gluteus maximus?
The gluteus maximus is innervated by the inferior gluteal nerve.
How is Trendelenburg's sign tested?
It is tested by having the patient stand on one leg; if the pelvis drops on the opposite side, the sign is positive.
How is each hip bone connected to the sacrum?
Each hip bone is firmly fixed to the lateral part of the sacrum at the sacroiliac joint.
Which nerve may be injured during a posterior dislocation of the hip joint?
The sciatic nerve.
Which part of the hip bone forms the posteroinferior part of the acetabulum?
The ischium.
Where is the femoral head located?
The femoral head is located at the proximal end of the femur and articulates with the acetabulum of the pelvis.
Where is the trochanteric bursa located?
The trochanteric bursa is present between the tendons of the gluteus medius and gluteus minimus and the greater trochanter.
Where does the subtalar joint occur?
The subtalar joint occurs where the talus rests on and articulates with the calcaneus.
In what type of accidents are ACL injuries commonly seen?
ACL injuries are commonly seen in skiing accidents.
What is the oblique popliteal ligament?
The oblique popliteal ligament is a ligament that is a reflection of the semi-membranosus muscle tendon and helps to reinforce the posterior aspect of the knee joint.
What nerve innervates the Sartorius muscle?
Femoral nerve
Where does the PCL attach in the femur?
The PCL attaches to the anterior part of the lateral surface of the medial condyle of the femur.
What is plantar flexion and which muscles are mainly responsible for it?
Plantar flexion is the movement of the foot downwards away from the shin, mainly performed by the Gastrocnemius and Soleus.
What are the two main bones of the lower leg?
The tibia and fibula.
What is the movement of the hip joint that rotates the thigh away from the midline?
Lateral rotation
Which muscles are responsible for flexing the hip in the anterior compartment of the thigh?
The flexors of the hip include the iliopsoas and rectus femoris.
What functions does the anterior cruciate ligament (ACL) serve?
The ACL prevents posterior displacement of the femur on the tibia and hyperextension of the knee joint.
What role does the rigid bony pelvis play in relation to body weight?
The rigid bony pelvis transmits the body weight through the acetabulum to the lower limb.
What are the menisci of the knee joint?
The menisci are crescentic plates of fibrocartilage on the articular surface of the tibia that deepen the surface and play a role in shock absorption.
What are the potential consequences of sciatic nerve injury during hip dislocation?
Paralysis of the hamstrings and muscles distal to the knee joint (both anterior and posterior).
What does a positive Trendelenburg's sign suggest?
A positive sign suggests weakness or dysfunction of the hip abductors on the standing leg side.
What is the significance of the greater and lesser trochanters?
The greater and lesser trochanters serve as important muscle attachment sites for muscles that move the hip and thigh.
What part of the hip bone does the pubis form?
The anterior part of the acetabulum and the anteromedial part of the hip bone.
What is the primary function of the obturator nerve?
The obturator nerve primarily innervates the adductor muscles of the thigh.
What type of joint is the subtalar joint?
The subtalar joint is a synovial joint.
What happens to the tibia during an ACL rupture?
During an ACL rupture, the free tibia slides anteriorly under the femur.
Why is the medial meniscus more prone to injury than the lateral meniscus?
The medial meniscus is more prone to injury due to its firm attachment to the tibial collateral ligament and greater movement during rotational activities.
Which nerve is responsible for the innervation of the Gracilis muscle?
Obturator nerve
What is the shape of the medial meniscus?
The medial meniscus is C-shaped and broader posteriorly than anteriorly.
What often disrupts the blood supply to the head of the femur in hip fractures?
Fracture of the neck of the femur often disrupts the blood supply to the head of the femur.
What happens to the tibia when the knee joint is flexed at a right angle in relation to the ACL?
When the joint is flexed at a right angle, the tibia cannot be pulled anteriorly because it is held by the ACL.
What is the largest sesamoid bone in the human body?
The patella.
What type of joint is formed at the superior tibiofibular joint?
Plane synovial joint between the head of fibula and lateral condyle of tibia.
In which position is the ankle joint stable?
The ankle joint is stable in dorsiflexion.
How are the menisci structured in terms of thickness?
The menisci are thicker at their external margins and taper to thin, unattached edges in the interior of the joint.
What is the primary function of the PCL?
The PCL prevents anterior displacement of the femur on the tibia and posterior displacement of the tibia on the femur, as well as helps prevent hyperflexion of the knee joint.
What is the main function of the extensor muscles in the anterior compartment of the thigh?
The main function is to extend the knee.
Which bone is the larger and stronger of the two in the lower leg?
The tibia.
What is the transverse tarsal joint?
The transverse tarsal joint is a compound joint formed by the talonavicular part of the talocalcaneonavicular and the calcaneocuboid joints.
How does the femur contribute to hip joint movement?
The femur allows for a wide range of movements at the hip joint, including flexion, extension, abduction, adduction, and rotation.
What is the keystone of the lateral longitudinal arch?
Cuboid
What is a common cause of a lateral ligament sprain?
A lateral ligament sprain is very common when the plantarflexed foot is excessively inverted.
What are the three main parts of the talus?
The three main parts of the talus are the head, neck, and body.
What is the fascia lata?
The deep fascia of the thigh that encloses the thigh like a sleeve.
Where does the obturator nerve originate?
The obturator nerve originates from the lumbar plexus, specifically from the L2 to L4 spinal nerves.
What surrounds the subtalar joint?
The subtalar joint is surrounded by a weak joint capsule.
What are the main movements of the knee joint?
Flexion and extension are the main knee movements; some rotation occurs when the knee is flexed.
What is the anterior drawer sign?
The anterior drawer sign is a clinical sign indicating that the tibia is sliding anteriorly under the femur, often associated with ACL injuries.
Which muscles are involved in hip joint flexion?
Psoas major, iliacus, sartorius, rectus femoris, and pectineus.
Where is the anterior end of the medial meniscus attached?
The anterior end (horn) of the medial meniscus is attached to the anterior intercondylar area of the tibia, anterior to the attachment of the ACL.
What are the main muscles located in the gluteal region?
The main muscles in the gluteal region include the gluteus maximus, gluteus medius, and gluteus minimus.
What nerve innervates the Tensor fascia lata?
Superior gluteal nerve
What type of movement commonly causes meniscal tears?
Twisting strains, such as kicking a football with a slightly flexed knee, commonly cause meniscal tears.
Which artery supplies most of the blood to the head and neck of the femur?
The medial circumflex femoral artery supplies most of the blood to the head and neck of the femur.
Describe the shape and orientation of the patella.
It is a flat, triangular bone with the base facing upward and the apex downward.
How are the tibia and fibula connected at the middle tibiofibular joint?
By a fibrous joint connected by the interosseous membrane.
Why is the ankle joint considered unstable in plantarflexion?
The ankle joint is unstable in plantarflexion, as seen in tiptoe movements during ballet dancing.
What is the role of the adductor group of muscles in the anterior compartment of the thigh?
The adductor group of muscles primarily functions to adduct the thigh.
Where are the menisci attached in the knee joint?
In transverse section, the menisci are firmly attached at their ends to the intercondylar area of the tibia, and their external margins are attached to the fibrous layer of the capsule of the knee joint.
What is the role of the femur in weight-bearing?
The femur plays a crucial role in weight-bearing by transferring forces from the pelvis to the lower leg during standing and walking.
What are the primary movements at the hip joint?
Flexion, extension, and restricted rotations.
In what position is the PCL the main stabilizing factor for the femur?
In the weight-bearing flexed knee, such as when walking downhill.
What is the primary function of the tibia?
To bear weight and support the body.
What are the two separate joints that form the transverse tarsal joint?
The two separate joints are the talocalcaneonavicular joint and the calcaneocuboid joint.
What are the intersegmental ties that maintain the lateral longitudinal arch?
Long and short plantar ligaments
Which muscles are responsible for flexion at the knee joint?
Hamstrings
What is the function of the head of the talus?
The head of the talus articulates with the navicular bone and plays a crucial role in the ankle joint's movement.
What are the superior boundaries of the fascia lata?
Anterior superior iliac spine, inguinal ligament, and pubic tubercle.
What is one function of the arches in the foot?
They distribute the body weight to the weight bearing points of the sole.
What ligaments support the subtalar joint?
The subtalar joint is supported by medial, lateral, posterior, and interosseous talocalcaneal ligaments.
What areas does the obturator nerve provide sensory innervation to?
The obturator nerve provides sensory innervation to the skin of the medial thigh.
What muscles are responsible for hip joint extension?
Gluteus maximus and hamstrings.
Where is the posterior end of the medial meniscus attached?
The posterior end of the medial meniscus is attached to the posterior intercondylar area, anterior to the attachment of the PCL.
What is the deep fascia of the thigh called?
Fascia lata
What happens when the leg is fully extended with the foot on the ground?
The knee passively 'locks' due to medial rotation of the femur on the tibia, making the lower limb a solid column for weight bearing.
What is the primary function of the gluteus maximus?
The primary function of the gluteus maximus is to extend and laterally rotate the hip joint.
What happens to the retinacular arteries during a femoral neck fracture?
The retinacular arteries often are torn when the femoral neck is fractured or the hip joint is dislocated.
What is the characteristic of the anterior aspect of the patella?
The anterior aspect is convex and rough.
How does the popliteus muscle protect the lateral meniscus?
The popliteus muscle protects the lateral meniscus by pulling the posterior horn backward, preventing it from being crushed between the articular surfaces.
Which muscles are primarily located in the anterior aspect of the thigh?
Sartorius, Quadriceps femoris, and Adductors
What is the keystone of the medial longitudinal arch?
Talus
What is the function of the transverse ligament of the knee?
The transverse ligament of the knee is a slender fibrous band that joins the anterior edges of the menisci, allowing them to move together during knee movements.
What type of joint is the inferior tibiofibular joint?
Syndesmosis variety of fibrous joint, which is the strongest of all three joints.
What are the hamstring muscles located in the posterior compartment of the thigh?
Semitendinosus, Semimembranosus, Biceps femoris, and ischial head of Adductor magnus.
How do the movements at the hip joint compare to those at the shoulder joint?
Movements in the hip region are more restricted compared to the relatively free shoulder joint.
What are the main types of femoral neck fractures?
The main types of femoral neck fractures are intracapsular and extracapsular fractures.
What is the role of the fibula in the lower leg?
To provide stability and support to the ankle.
What structures act as tie beams for the lateral longitudinal arch?
Plantar aponeurosis (lateral part) and intrinsic muscles of the little toe
What is a standard method for surgical amputation of the foot?
Transection across the transverse tarsal joint is a standard method for surgical amputation of the foot.
What muscle group is responsible for extension at the knee joint?
Quadriceps femoris
What are the factors that maintain the arches of a stone bridge?
The factors include the shape of the arch, the weight distribution of the materials, and the use of keystones that lock the structure in place.
What is the primary function of the femoral nerve?
The femoral nerve primarily innervates the quadriceps muscle and provides sensation to the anterior thigh and part of the medial leg.
What is the significance of the neck of the talus?
The neck of the talus connects the head to the body and is important for the stability and movement of the ankle joint.
How is the medial meniscus related to the tibial collateral ligament?
The medial meniscus is firmly adhered to the deep surface of the tibial collateral ligament.
How do the arches of the foot act as a shock absorber?
They absorb shock while jumping.
What are the lateral boundaries of the fascia lata?
Iliac crest.
What may be the only remaining source of blood to the proximal fragment after a femoral neck fracture?
The artery to the ligament of the femoral head may be the only remaining source of blood to the proximal fragment.
Which muscle in the gluteal region is responsible for hip abduction?
The gluteus medius is primarily responsible for hip abduction.
Which muscles facilitate hip joint abduction?
Gluteus medius, gluteus minimus, tensor fascia latae, and sartorius.
What features are present on the posterior aspect of the patella?
The posterior aspect has medial and lateral articular surfaces.
What is the benefit of the knee being locked?
When the knee is locked, the thigh and leg muscles can relax briefly without making the knee joint too unstable.
What is the function of the iliotibial band?
It stabilizes the knee both in extension and in partial flexion.
What are the main types of arches in the foot?
The main types of arches in the foot are the medial longitudinal arch, lateral longitudinal arch, and transverse arch.
