Parotid Gland and Temporal Region Flashcards
What is the innervation of the muscles of mastication?
Mandibular branch of Trigeminal nerve (CN V3)
What are the attachments of medial pterygoid?
Superficial head - tubercle of maxilla
Deep head - medial surface of lateral pterygoid plate
Inserts into medial surface of the angle of the mandible
What is this muscle?
Masseter
What are the attachments of temporalis?
Temporal fossa and fascia
To the coronoid process and anterior border of the ramus of the mandible
What is the deepest structure of the parotid gland?
Auriculotemporal nerve - a branch of the trigeminal nerve (CN V)
What are the divisions of Trigeminal Nerve (CN V)?
Ophthalmic
Maxillary
Mandibular
True or False?
All divisions of the Trigeminal Nerve (CN V) carry sensory and motor branches
False!
Only the mandibular has both
Ophthalmic and Maxillary divisions are purely sensory
What are the anterior branches of the external carotid artery?
Superior Thyroid
Lingual
Facial
What branch of CN V3 innervates the masseter?
Masseteric nerve from anterior division of CN V3
What is this muscles?
Temporalis
What are the 5 branches of the facial nerve (CN VII)?
Temporal Zygomatic Buccal Mandibular Cervical
What are the 4 muscles of mastication?
Temporalis
Masseter
Medial Pterygoid
Lateral Pterygoid
What forms the retromandibular vein?
Union of the superficial temporal and maxillary veins
What muscle does the posterior auricular branch of the facial nerve supply?
Posterior belly of Occipitofrontalis - a muscle of the scalp
What regions of the face does the parotid lymph nodes drain?
Parotid gland
Part of forehead
Oribital region
What are the attachments of masseter?
Zygomatic arch
To the lateral aspect of the ramus
Describe what movements the different fibres of temporalis do?
Anterior and Superior fibres - elevate mandible
Posterior fibres - Retract mandible
What movements does the medial pterygoid assist in?
Elevations Lateral chewing (with lateral pterygoids)
Where does the parotid gland sit?
Lateral side of the face, passes from near the external auditory meatus inferiorly toward the mandible
Sits around 1 fingers breadth below the zygomatic arch
What movements does the masseter muscle facilitate?
Elevation of the mandible
What are the vessels that are found in the parotid gland?
Superficial temporal vein
External carotid artery
Upon fibres of which nerve does the glossopharyngeal nerve (CN IX) hitch a ride with to reach the parotid gland?
Trigeminal nerve - CN V
What are the movements of the lateral pterygoid muscle?
Protrusion - pulls the neck of the mandible forwards with the articular disc (both sides)
Lateral chewing movements alongside medial pterygoid (one side)
What are the terminal branches of the external carotid artery?
Superficial temporal artery
Maxillary artery
What branches of CN V3 innervate temporalis?
Deep temporal nerves (x2) from the anterior division of CN V3
What is the relationship of the facial nerve (CN VII) and the parotid gland?
Once the facial nerve exits skull it passes into the parotid gland
Divides the gland into a superficial and deep part before it divides into 5 branches that supply the muscles of facial expression
What are the attachments of lateral pterygoid?
Upper head - infratemporal surface of greater wing of sphenoid
Lower head - lateral surface of the lateral pterygoid plate
Inserts into neck of mandible and the articular disc
Describe the carrying action of the lingual nerve (branch of CN V3)
Lingual nerve is joined by chorda tympani carrying parasympathetic fibres from the facial nerve (CN VII) to the submandibular (ganglion) and sublingual glands
Provides taste to the anterior 2/3 of the tongue
What are the movements of the mandible?
Elevation and Depression
Protrusion and Retrusion
Lateral Sliding
What nerve supplies the parotid gland?
Glossopharyngeal Nerve - CN IX
How does the parotid gland enter the mouth?
Pierces the Buccinator muscle and enters the oral cavity at the upper second molar
What are the posterior branches of the external carotid artery?
Occipital
Posterior auricular
Ascending pharyngeal