8.0 Infratemporal Fossa and Temporomandibular Joint

Question 1

Nerve to the mylohyoid arises off of what other nerve?

Answer 1

Inferior alveolar N.

Question 2

What muscles are responsible for depression of the jaw?

Answer 2

Suprahyoid muscles.

Infrahyoid muscles.

Lateral Pterygoid.

Question 3

The “tensor” muscles of the face are innervated by which cranial nerve?

Answer 3

Trigeminal N.

Question 4

What is the specific funciton of the stylomandibular and sphenomandibular Ls.?

Answer 4

The stylomandibular L. and the sphenomandibular L. specifically halt anterior dislocation of the mandible.

Question 5

Identify the corresponding structures.

Answer 5

Question 6

What muscles are responsible for the protraction of the jaw?

Answer 6

Masseter.

Lateral pterygoid.

Medial pterygoid.

Question 7

What do the cell bodies of the otic ganglion ultimately serve?

Answer 7

The parotid gland.

Question 8

What are the muscles of mastication?

Answer 8

Temporalis M..

Masseter M..

Lateral and Medial Pterygoid Ms.

Question 9

What pulls the articular disc of the TMJ forward during wide jaw opening?

Answer 9

Superior head of the lateral pterygoid M.

Question 10

What is the function of the buccal N. from the mandibular branch of the trigeminal?

What is the funciton of the buccal branch of the facial nerve?

Answer 10

Buccal nerve from V3 provides sensation to the interior cheek and part of the gums.

The buccal branch of the facial nerve provides motor innervation to the buccinator muscle.

Question 11

What four ligaments hold the TMJ together?

Answer 11

Joint capsule

Sylomandibular L.

Sphenomandibular L.

Lateral temporomandibular L.

Question 12

Where is the injection site for the anterior superior alveolar nerve?

Answer 12

Just at the exit of the infraorbital foramen. The infraorbital nerve must be blocked.

Question 13

Where does the branchiomotor portion of the facial nerve exit the skull?

Answer 13

Through the stylomastoid foramen.

Question 14

A fracture of the ramus of the mandible can damabe what structures?

Answer 14

Inferior alveolar artery and nerve.

Question 15

What muscles are responsible for “retrusion” of the mandible?

Answer 15

Masseter M.

Temporalis M.

Question 16

What foramen does the inferior alveolar N. enter?

Answer 16

The mandibular foramen.

Question 17

What muscles are innervated by V3?

Answer 17

Muscles of mastication.

Mylohyoid M. and anterior belly of the digastric M.. (Nerve to mylohyoid.)

Tensor veli palatini M.

Tensor tympani M.

Question 18

Nerve to the tensor tympani comes out of what structure?

Answer 18

The otic ganglion

Question 19

What muscles are responsible for lateral movements of the jaw?

Answer 19

Lateral pterygoid M.

Temporalis M.

Masseter M.

Question 20

What are the contents of the infratemporal fossa?

Answer 20

Question 21

What are the boundaries of the infratemporal fossa?

Answer 21

Question 22

What kind of fibers are carried in the lingual nerve?

Answer 22

Sensory nerve fibers. (Not taste, which is carried by the chorda tympani, which runs with the lingual nerve, but is not IN the lingual nerve.)

Question 23

What muscles are responsible for elevation of the jaw?

Answer 23

Temporalis M.

Masseter M.

Medial pterygoid M.

Question 24

What nerves supply the TMJ?

Answer 24

Auriculotemporal (posterior branch).

Deep temporal (before it goes into the temporal region).

Masseteric N.

Question 25

Where can we find the otic ganglion?

Answer 25

Posterior and inferior to V3 as it exits the foramen ovale.

Question 26

Fracture high on the neck of the mandible can interfere with what structures?

Answer 26

Branches of the maxillary A. - such as deep auricular and anterior tympanic.

Question 27

What are the accessory muscles of mastication?

What are they innervated by?

Answer 27

Buccinator M. and Orbicularis Oris M.

Facial Nerve (as muscles of facial expression).

Question 28

Where are the injection sites for the posterior and middle superior alveolar nerve blocks?

Answer 28

By the molars for posterior, and by the premolars for middle.

Question 29

Where is the injection site for the inferior posterior alveolar nerve?

Answer 29

Just inferior and lateral to the pterygomandibular raphe.

(The pterygomandibular raphe is the junction of the buccinator and the superior pharyngeal constrictor Ms.)