What is the focus of Byram's 2017 article?
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Proximal humerus fractures of the shoulder.
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What is the focus of Byram's 2017 article?
Proximal humerus fractures of the shoulder.
What type of fractures are discussed in the case report by Maalouly et al. (2019)?
Bilateral comminuted proximal humerus fractures.
What surgical procedure is highlighted in the 2019 case report?
Simultaneous ORIF (Open Reduction and Internal Fixation).
Who were the subjects of the case report by Maalouly et al.?
An elderly patient.
What muscle forms the medial wall of the axilla?
Serratus anterior.
What is the composition of the rotator cuff muscles?
Composed of SITS: Supraspinatus, Infraspinatus, Teres Minor, and Subscapularis.
What is the shape of the trapezius muscle?
Diamond-shaped.
What is the primary function of the clavicle?
To connect the axial and appendicular skeleton and support the upper extremity.
What is the function of the serratus anterior muscle?
It holds the scapula in place against the thoracic wall.
What is the primary function of the rotator cuff muscles?
To stabilize the humerus and ensure the humeral head is centered in the glenoid cavity during movement.
What is the primary action of the trapezius muscle?
Shoulder shrugging.
What is the layman's term for the clavicle?
Collar bone.
What nerve innervates the serratus anterior?
Long thoracic nerve.
Which muscle initiates abduction of the shoulder?
Supraspinatus.
What is the knobby projection located inferior to the clavicle called?
It is a projection that can be felt when palpated from the clavicle, just before the acromion.
What is the primary function of the scapulohumeral muscles?
To connect the scapula to the proximal humerus.
What is the origin and insertion of the subscapularis muscle?
Originates from the subscapular fossa and inserts at the lesser tubercle of the humerus.
Which cranial nerve innervates the trapezius?
Accessory or spinal accessory nerve.
What joints are associated with the clavicle?
Acromioclavicular joint (AC Joint) and sternoclavicular joint.
What condition is caused by injury to the long thoracic nerve?
Winging of the scapula.
What is the innervation of the supraspinatus muscle?
Suprascapular nerve.
What congenital condition is associated with a shallow socket in the lower extremities?
Congenital hip dysplasia (DDH).
What are the components of the rotator cuff muscles?
Supraspinatus, Infraspinatus, Teres minor, Subscapularis (SITS).
What is the origin of the Supraspinatus muscle?
Supraspinous fossa of the scapula.
What is the primary function of the subscapularis muscle?
Holds the humeral head against the glenoid fossa of the scapula.
How is the shape of the clavicle described when viewed from the top?
It is shaped like an 'S'.
How can winging of the scapula be tested?
By having the patient push against a wall and observing the scapula.
What is the function of the latissimus dorsi?
Extends, adducts, and medially rotates the upper limb.
What is the function of the infraspinatus muscle?
Lateral rotation of the arm and maintaining the humeral head within the glenoid.
What is the proximal attachment of the Pectoralis major?
Clavicular head: anterior surface of medial half of clavicle; Sternocostal head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle.
What is the main action of the deltoid muscle's middle part?
Abduction (strong abductor).
What is the treatment for developmental dysplasia of the hip?
It can be treated conservatively if the joint can be mechanically attached during child development; some cases may need corrective bone work.
What is the action of the Supraspinatus muscle?
Initiates and assists deltoid in abduction of the arm.
What is the most common rotator cuff injury?
Subacromial bursitis.
Where is the levator scapulae located?
Deep to the sternocleidomastoid and trapezius.
What structures does the clavicle protect?
Neurovascular structures located posterior to it.
What is commonly referred to as 'The Boxer’s Muscle'?
Serratus anterior.
Which nerve innervates the teres minor muscle?
Axillary nerve.
What are the main contents of the axilla?
Axillary arteries, axillary veins, axillary lymph nodes, brachial plexus, and axillary sheath.
Which nerve innervates the deltoid muscle?
Axillary nerve.
Which nerve innervates the Supraspinatus muscle?
Suprascapular nerve (C4, C5, C6).
What is the main action of the Pectoralis major?
Adducts and medially rotates humerus; draws scapula anteriorly and inferiorly.
What type of injury did Doc Jojo's patient sustain?
A midclavicular fracture with superior displacement of the proximal clavicle and inferior displacement of the distal clavicle.
What is the primary function of the levator scapulae?
Elevates the scapula.
What causes pain during shoulder abduction in subacromial bursitis?
Inflammation of the bursae.
What muscles are part of the anterior thoraco-appendicular group?
Subclavius, Pectoralis Major, Pectoralis Minor, Serratus Anterior.
What is the shape of the axilla?
Pyramid-shaped.
What joint shows palpable movement during upper limb circumduction?
The sternoclavicular joint.
What is the role of the rotator cuff in shoulder movement?
Provides a delicate biomechanical balance that allows shoulder movement without instability or pain.
What is the source of blood supply in the axilla?
Axillary arteries, which are a continuation of the subclavian artery.
What can cause deltoid atrophy?
Injury to the axillary nerve, often from fractures of the surgical neck of the humerus or anterior shoulder dislocation.
What is the origin of the Infraspinatus muscle?
Infraspinous fossa of the scapula.
What is the innervation of the Pectoralis minor?
Medial pectoral nerve (C8, T1).
What are the four anterior thoraco-appendicular muscles?
Subclavius, Pectoralis Major, Pectoralis Minor, and Serratus Anterior.
What do the rhomboids do?
Retract and rotate the scapula.
Which muscle is located in the pectoral region and is responsible for shoulder flexion?
Pectoralis Major.
What is the role of the bursa in the shoulder?
Serves as a cushion to protect tendons from irritation.
What is the main artery that enters the axilla?
The axillary artery.
What structures form the apex of the axilla?
Area between the 1st rib, clavicle, and scapula.
How does the supraspinatus contribute to shoulder movement?
It initiates abduction of the shoulder for the first 15 degrees.
What bones are involved in upper limb circumduction?
Humerus, clavicle, and scapula.
How are the cords of the brachial plexus named?
In relation to the axillary artery.
What do axillary veins drain into?
The subclavian vein.
What happens when the axillary nerve is injured?
Deltoid paralysis, weak flexion and extension, loss of shoulder roundedness, and inability to abduct beyond 15 degrees.
Which nerve innervates the rhomboids?
Dorsal scapular nerve.
What is the action of the Infraspinatus muscle?
Laterally rotates the arm.
What is the significance of the axilla in anatomy?
It contains major structures and serves as a passageway for neurovascular bundles.
What is the function of the subclavius muscle?
It serves as an added cushion for the vascular and neurovascular structures posterior to it.
What is the main action of the Serratus anterior?
Protracts scapula and holds it against thoracic wall; rotates scapula.
What happens in a complete supraspinatus tear?
Inability to initiate shoulder abduction.
At what anatomical landmark does the axillary artery begin?
At the lateral border of the 1st rib.
What common activities can lead to rotator cuff injuries?
Throwing activities.
What forms the lateral wall of the axilla?
Intertubercular sulcus (bicipital groove).
What is the most commonly injured bone in the body?
The clavicle.
What is the position of the Lateral Cord in relation to the axillary artery?
Lateral to the axillary artery.
What role do axillary lymph nodes play?
They are important for the immune system and part of the lymphatic system.
What is the role of the supraspinatus in shoulder abduction?
It initiates the first 15 degrees of abduction.
Which nerve innervates the Infraspinatus muscle?
Suprascapular nerve (C5, C6).
What is the innervation of the teres major muscle?
Lower subscapular nerve.
What is the proximal attachment of the Trapezius?
Medial third of superior nuchal line; external occipital protuberance; nuchal ligament; spinous processes of C7-T12 vertebrae.
What is the surface anatomy of the pectoral region and axilla associated with?
Muscles like Pectoralis Major, Deltoid, and Trapezius, as well as bones like the Clavicle and Scapula.
What is the primary function of the pectoralis major?
It adducts and medially rotates the upper limb.
What is the shape and function of the clavicle?
The clavicle is an 'S' shaped bone that supports the upper extremity, serves as an attachment point for muscles, and protects neurovascular structures.
What are the two types of rhomboids?
Rhomboid Major and Rhomboid Minor.
What does the axillary artery become as it crosses the teres major?
The brachial artery.
Which muscles form the posterior wall of the axilla?
Subscapularis, Teres Major, Latissimus dorsi.
What is the typical healing time for a fractured clavicle in children?
4-6 weeks.
What nerve supplies the anterior compartment of the arms?
Musculocutaneous Nerve.
What is the brachial plexus?
A complex network of nerves supplying sensation and motor innervation to the upper extremity and hand.
What was the cause of the elderly patient's glenohumeral dislocation?
The caregiver pulling the patient back to bed via the shoulder/armpits area.
What is the origin of the Teres Minor muscle?
Middle part of the lateral border of the scapula.
What is the main action of the Latissimus dorsi?
Extends, adducts, and medially rotates humerus; raises body toward arms during climbing.
What are the functions of the teres major muscle?
Medial rotation, arm adduction, and shoulder joint stabilization.
Where does the pectoralis minor originate and attach?
It originates from the 3rd to 5th rib and attaches to the coracoid process of the scapula.
What is the role of the scapula?
The scapula is a triangular, flat bone that serves as an attachment point for shoulder muscles and contributes to the mobility of the upper extremity.
How is the axillary artery divided?
Into three segments by the pectoralis minor muscle.
What conservative treatments are commonly used for a fractured clavicle?
Arm sling and figure 8 splint.
Which nerve supplies the deltoid muscle?
Axillary Nerve.
Which spinal nerves form the brachial plexus?
C5, C6, C7, C8, and T1.
What incident led to the young adult patient's proximal humerus fracture?
The patient consumed alcohol and then rode a motorcycle home.
What is the action of the Teres Minor muscle?
Laterally rotates the arm.
What is the innervation of the Levator scapulae?
Dorsal scapular (C4, C5) and cervical (C3, C4) nerves.
What is frozen shoulder also known as?
Adhesive capsulitis.
What injury can occur to the pectoralis minor?
Injury can occur when it gets overstretched, causing sharp pain around the area when reaching forward.
What are thoraco-appendicular muscles?
Muscles that attach the thoracic area to the extremities, including the subclavius, pectoralis major, pectoralis minor, and serratus anterior.
What causes the gross deformity seen in a fractured clavicle?
The displaced broken segment tenting the skin.
What is the mnemonic for the branches of the axillary artery?
Some Times Life Seems A Pain.
What are the effects of an upper brachial plexus injury?
Inability to raise the arm, weakness of the arm, and inability to flex the elbow.
How can the brachial plexus be visualized?
As a complex train/subway station where roots combine to form trunks.
What is the main action of the Rhomboid major?
Retracts scapula and rotates its glenoid cavity inferiorly; fixes scapula to thoracic wall.
Which nerve innervates the Teres Minor muscle?
Axillary nerve (C5, C6).
What are common symptoms of frozen shoulder?
Progressive pain and stiffness without a history of trauma.
What is the appearance of the serratus anterior muscle?
It has serrations, resembling the end of a knife.
What happens if the long thoracic nerve is injured?
Injury to the long thoracic nerve can result in scapular winging.
What is the main deforming force acting on a fractured clavicle?
The weight of the arm.
What causes an upper brachial plexus injury?
A sudden forceful movement that widens the angle between the shoulder and neck.
What are the branches of the first segment of the axillary artery?
Superior thoracic artery.
What are the three trunks of the brachial plexus?
Superior trunk (C5, C6), Middle trunk (C7), and Inferior trunk (C8, T1).
What is the origin of the Subscapularis muscle?
Subscapular fossa (most of the anterior surface of the scapula).
What is the innervation of the Deltoid muscle?
Axillary nerve (C5, C6).
Why is the supraspinatus the most commonly injured rotator cuff muscle?
It is thin and most active in overhead activities.
What is the axilla and its significance?
The axilla, or armpit, is a pyramid-shaped space containing neurovascular structures and serves as a distribution point for blood and nerves.
What muscle displaces the fragments of a fractured clavicle medially?
Pectoralis major.
What are the effects of a lower brachial plexus injury?
Diminished or lost hand function, and the hand may assume a claw position.
Which two branches arise from the second segment of the axillary artery?
Thoraco-acromial and Lateral thoracic arteries.
What do the anterior divisions of the trunks form?
Lateral cord, medial cord, and posterior cord.
What is the action of the Subscapularis muscle?
Medially rotates the arm and helps hold the head of the humerus in the glenoid cavity.
What is the main action of the Teres major?
Adducts and medially rotates arm.
How is the axillary artery divided?
The axillary artery is divided into three segments by the pectoralis minor muscle.
What causes a lower brachial plexus injury?
A sudden movement of the arm that widens the angle between the arm and chest wall.
What is the shape and location of the scapula?
Triangular, flat bone lying on the posterior thoracic wall.
What are the branches of the third segment of the axillary artery?
Subscapular, Anterior circumflex humeral, and Posterior circumflex humeral arteries.
Why is the brachial plexus complex?
Due to the complexity of movement of the upper extremities.
Which nerves innervate the Subscapularis muscle?
Upper and lower subscapular nerves (C5, C6, C7).
What muscles are included in the posterior thoraco-appendicular group?
The trapezius, latissimus dorsi, levator scapulae, and rhomboids.
Which nerves arise from the posterior cord of the brachial plexus?
Axillary Nerve and Radial Nerve.
What is the function of the muscles attached to the scapula?
They stabilize the scapula and allow for a wide range of shoulder mobility.
What does the axillary vein accompany?
The axillary artery.
What are scapulohumeral muscles and their function?
Scapulohumeral muscles, including the deltoid and rotator cuff muscles, stabilize the humerus and facilitate shoulder movement.
What is a useful memory aid for understanding the brachial plexus?
Drawing it in a color-coded format.
What is the glenoid fossa?
An oval-shaped depression on the lateral angle of the scapula that connects with the humeral head.
What lymph nodes receive drainage from the lateral quadrant of the breast?
Anterior (pectoral) group of axillary lymph nodes.
What injury might Luis have suffered after his pull-up incident?
Luis likely suffered a lower brachial plexus injury, indicated by numbness and loss of hand function.
What is the clinical significance of palpating axillary lymph nodes during breast examinations?
To check for possible malignancy or infection in the breast.
How does the glenohumeral joint differ from the acetabulofemoral joint?
The glenohumeral joint has a shallower depression, specializing it for movement, while the acetabulofemoral joint is deeper, specializing it for stability.
Which nerve innervates the deltoid muscle?
The axillary nerve.
Which group of axillary lymph nodes receives lymph from the upper extremity?
Lateral/Humeral group.
Which muscle is innervated by the accessory nerve?
The trapezius muscle.
What muscle is commonly involved in pain after improper chopping wood technique?
The latissimus dorsi.
