What does the sphenopalatine foramen connect?
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The pterygopalatine fossa to the nasal cavity, specifically the superior meatus.
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What does the sphenopalatine foramen connect?
The pterygopalatine fossa to the nasal cavity, specifically the superior meatus.
What forms the sphenopalatine foramen?
The sphenopalatine notch at the superior aspect of the perpendicular plate of the palatine bone and the body of the sphenoid.
What is the pathway of the motor branches of the mandibular nerve?
They pass medial to the trigeminal ganglion, through the foramen ovale, and join the sensory part of the mandibular nerve.
What structures are transmitted through the sphenopalatine foramen?
The sphenopalatine artery and vein, as well as the nasopalatine nerve.
What is the function of the masseteric nerve?
It supplies the masseter muscle.
What is the nasopalatine nerve a branch of?
The pterygopalatine ganglion (CNV2).
Where does the deep temporal nerve originate from?
It usually originates from the anterior trunk of the mandibular nerve.
What is the origin of the sensory part of the mandibular nerve?
It arises from the trigeminal ganglion in the middle cranial fossa.
What muscles does the nerve to the medial pterygoid supply?
It supplies the medial pterygoid muscle, tensor veli palatini muscle, and tensor tympani muscle.
Where does the auriculotemporal nerve provide cutaneous sensation?
To the scalp, lateral of the temple.
How does the nerve to the lateral pterygoid muscle reach its target?
It passes directly into the deep surface of the lateral pterygoid muscle.
What are the branches of the mandibular nerve?
The mandibular nerve has several branches including the inferior alveolar nerve, lingual nerve, and buccal nerve.
What are the two roots of the auriculotemporal nerve?
Superior and inferior roots that converge near the middle meningeal artery.
What is the role of the buccal nerve?
It may carry motor branches and supplies the buccinator muscle.
What is the function of the chorda tympani?
The chorda tympani carries taste sensations from the anterior two-thirds of the tongue and provides parasympathetic innervation to the submandibular and sublingual glands.
What type of fibers run to the otic ganglion from the auriculotemporal nerve?
Secretory-motor fibers.
What is the first branch of the maxillary artery mentioned in the infratemporal fossa?
Middle meningeal artery.
Which nerve is responsible for sensation in the lower jaw?
The inferior alveolar nerve, a branch of the mandibular nerve.
What is the shape of the masseter muscle?
Quadrangular.
What does the inferior alveolar nerve supply?
Mandibular teeth.
Where does the middle meningeal artery enter the cranial cavity?
Through the foramen spinosum.
What type of fibers does the lingual nerve carry?
The lingual nerve carries general sensory fibers from the anterior two-thirds of the tongue.
What connects the pterygopalatine fossa with the infratemporal fossa?
Pterygomaxillary fissure.
Where do the muscle fibers from the two heads of the lateral pterygoid insert?
Into the neck of the mandible and into the capsule of the temporomandibular joint.
Where is the masseter muscle anchored?
Above to the zygomatic arch and below to the lateral surface of the ramus of the mandible.
What major structure does the middle meningeal artery supply?
Much of the dura mater, bone, and related bone marrow of the cranial cavity walls.
What is the function of the lingual nerve?
Carries sensory axons and acts as a conduit for special sensory and autonomic fibers from the chorda tympani.
How does the chorda tympani connect to the mandibular nerve?
The chorda tympani joins the lingual nerve, a branch of the mandibular nerve.
Which nerve exits through the pterygomaxillary fissure to supply the maxillary molars?
Posterior superior alveolar nerve.
What is the function of the lateral pterygoid muscle fibers when contracted?
They pull the articular disc and head of the mandible forward onto the articular tubercle, protruding the lower jaw.
What is the primary function of the masseter muscle?
To elevate the mandible.
What can cause damage to the middle meningeal artery leading to an extradural hematoma?
Lateral blows to the head, especially at the pterion.
Which part of the tongue does the lingual nerve supply?
The anterior two-thirds of the tongue.
What structure does the foramen rotundum conduct?
Maxillary nerve.
Which nerve innervates the lateral pterygoid muscle?
The mandibular nerve via the nerve to the lateral pterygoid.
What are the origins of the superficial part of the masseter muscle?
From the maxillary process of the zygomatic bone and anterior 2/3 of the zygomatic process of the maxilla.
What does the inferior alveolar artery supply?
All lower teeth, buccal gingivae, chin, and lower lip.
What does the buccal nerve predominantly supply?
General sensory nerves to adjacent skin and oral mucosa.
What does the pterygoid canal carry?
Nerve, artery, and vein of the pterygoid canal.
What happens when the lateral and medial pterygoids contract on only one side?
The chin moves to the opposite side, resulting in coordinated chewing movement.
What nerve innervates the masseter muscle?
Masseteric nerve from the mandibular nerve (V3).
What is the function of the intrinsic lateral ligament of the TMJ?
It strengthens the TMJ laterally and prevents posterior dislocation of the joint.
What are the deep temporal arteries responsible for supplying?
Temporalis muscle.
Which muscles does the buccal nerve provide motor innervation to?
Lateral pterygoid muscle and part of the temporalis muscle.
What does the pharyngeal canal communicate with?
Nasopharynx.
What shape is the pterygopalatine fossa?
Cone-shaped.
What joint does the head of the mandible articulate with?
The temporal bone to form the temporomandibular joint.
What is the shape of the medial pterygoid muscle?
Quadrangular with deep and superficial heads.
Where does the stylomandibular ligament extend from and to?
From the styloid process to the posterior margin and angle of the mandible.
What do the pterygoid arteries supply?
Pterygoid muscles.
What are the two main fossae included in the temporal region?
Temporal fossa and infratemporal fossa.
Which fissure forms the superior boundary of the pterygopalatine fossa?
Inferior orbital fissure.
Where does the pterygopalatine fossa extend to?
From the infratemporal fossa to the nasal cavity via the sphenopalatine foramen.
Where does the inferior alveolar nerve enter and exit the mandible?
Enters at the mandibular foramen and exits at the mental foramen.
Where does the deep head of the medial pterygoid muscle attach?
To the medial surface of the lateral plate of the pterygoid process.
What is the origin and insertion of the sphenomandibular ligament?
From the spine of the sphenoid to the lingual on the medial side of the ramus of the mandible.
What artery accompanies the masseteric nerve?
Masseteric artery.
What muscle is primarily attached in the temporal fossa?
Temporalis muscle.
What passes through the inferior orbital fissure?
Zygomatic branch of the maxillary nerve and the infraorbital artery and vein.
Which bones are located around the pterygopalatine fossa?
Maxilla, sphenoid, and palatine bones.
What is the mylohyoid line?
A line on the medial surface of the body of the mandible for attachment of mylohyoid muscles.
What is the main action of the medial pterygoid muscle?
To elevate the mandible and assist in protruding the lower jaw.
What occurs during the first phase of maximum depression of the mandible?
The head of the mandible rotates along the horizontal axis.
Which nerves are numbed during the anaesthesia of mandibular teeth?
Lingual nerve and inferior alveolar nerve.
What are the boundaries of the temporal fossa?
Bounded by superior and inferior temporal lines posteriorly and superiorly, frontal and zygomatic bones anteriorly, zygomatic arch laterally, and infratemporal crest inferiorly.
What is the terminal branch of the maxillary artery that supplies the nasal cavity?
Sphenopalatine artery.
What is the second branch of the trigeminal nerve?
Maxillary nerve (CNV2).
What does the greater palatine canal communicate with?
Oral cavity.
What are the two processes found on the ramus of the mandible?
The condylar and coronoid processes.
What is the shape of the lateral pterygoid muscle?
Thick triangular.
What muscles are involved in pushing the hinge forward during the second phase of movement at the TMJ?
Lateral pterygoid muscles.
Where is the injection site for anaesthesia of mandibular teeth located?
Lateral to the pterygomandibular fold.
What forms the floor of the temporal fossa?
Frontal, parietal, temporal, and greater wing of sphenoid bones.
What does the descending palatine artery branch into?
Greater and lesser palatine arteries.
How does the maxillary nerve enter the pterygopalatine fossa?
Through the foramen rotundum.
What structures are transmitted by the greater palatine canal?
Descending palatine artery and vein, greater palatine nerve, and lesser palatine nerve.
What is the function of the sphenomandibular ligament?
It stabilizes the jaw.
Where does the upper head of the lateral pterygoid muscle originate?
From the roof of the infratemporal fossa.
What is the origin of the chorda tympani?
From the petrous part of the temporal bone.
What can cause dislocation of the temporomandibular joint?
A blow to the side of the face, yawning, or taking a large bite.
What is the shape and location of the infratemporal fossa?
Irregularly shaped space deep and inferior to the zygomatic arch, deep to the ramus of the mandible and posterior to the maxilla.
What does the infraorbital artery supply?
Lacrimal gland and some muscles of the eye.
What is the function of the pterygopalatine ganglion?
It provides parasympathetic innervation to various glands.
What is the pterygoid fovea?
A shallow depression on the anterior surface of the neck of the mandible for attachment of the lateral pterygoid muscle.
What type of nerve fibers does the chorda tympani carry?
Parasympathetic nerve fibers and taste fibers for the anterior 2/3 of the tongue.
What happens to the head of the mandible during a dislocation?
It slips out of the mandibular fossa and is pulled anteriorly.
What structures are contained within the infratemporal fossa?
Muscles of mastication, branches of the mandibular nerve, and branches of the maxillary artery.
Where does the masseter muscle insert?
Lateral side of the ramus.
What does the posterior superior alveolar artery supply?
Teeth and gingiva.
Which nerve predominantly innervates the pterygopalatine ganglion?
Greater petrosal branch of the facial nerve (CNVII).
What forms the angle of the mandible?
The intersection of the posterior and inferior borders of the ramus.
What happens if the lingual nerve is injured proximal to the chorda tympani?
Loss of general sensation from the anterior 2/3 of the tongue, oral mucosa, gingivae, lower lip, and chin.
What is the major nerve that supplies the pterygoid muscles?
The V3 mandibular nerve.
What are the two types of muscles involved in mastication?
Superficial muscles (temporalis and masseter) and deeper muscles (medial and lateral pterygoid muscles).
What is the insertion point of the medial pterygoid muscle?
Angle of the mandible (medial side).
What type of fibers leave the pterygopalatine ganglion?
Postsynaptic parasympathetic fibers.
What is the largest branch of the external carotid artery?
Maxillary artery.
What are the two branches of the V3 mandibular nerve?
Anterior and posterior branches.
What is the origin of the temporalis muscle?
From the bony surface of the temporal fossa superiorly to the inferior temporal line.
Where does the temporalis muscle insert?
Coronoid process (medial side).
What glands receive secretomotor innervation from the pterygopalatine ganglion?
Lacrimal gland and mucosal glands of the oral cavity, nose, and pharynx.
What areas does the maxillary artery supply?
Nasal cavity, lateral wall and roof of oral cavity, all teeth, and dura mater in cranial cavity.
Which branch of the V3 nerve supplies the muscles of mastication?
The anterior branch.
How does the temporalis muscle insert on the mandible?
Its tendon passes between the zygomatic arch and the infratemporal crest to insert on the coronoid process of the mandible.
What is unique about the lateral pterygoid muscle's insertion?
It is the only muscle inserted near the TM joint, with both heads attached to the neck/capsule of the TM joint.
Where does the maxillary artery originate?
Within the substance of the parotid gland.
What is the primary function of the temporalis muscle?
To elevate the mandible powerfully to close the jaw.
What are the major actions of the muscles of mastication on the mandible?
Depression, elevation, retraction, protrusion, and rotatory movement.
What branches arise from the first part of the maxillary artery?
Middle meningeal artery and inferior alveolar arteries.
Which nerve innervates the temporalis muscle?
The anterior trunk of the mandibular nerve (V3) via the deep temporal nerves.
Which muscle is most important for maximum depression of the mandible?
Lateral pterygoid muscle.
What does the second part of the maxillary artery give rise to?
Deep temporal, masseteric, buccal, and pterygoid branches.
Which muscles are involved in the elevation of the mandible?
Temporalis, masseter, and medial pterygoid.
What role does the mylohyoid muscle play in mandible movement?
It can move the mandible when the hyoid is fixed, although it is not a muscle of mastication.
What type of joint is the temporomandibular joint (TMJ)?
A synovial joint.
What separates the TM joint into superior and inferior parts?
A fibrous articular disc.
What movements are allowed by the lower part of the TM joint?
Mainly hinge-like depression and elevation of the mandible.
What movements are allowed by the upper part of the TM joint?
Protrusion and retraction of the mandible.
What does the joint capsule of the TMJ contain?
Synovial membrane and fibrous membrane.
