Deep Face And Infratemporal Fossa

Question 1

Temporal fossa is the space superior to the ____.

Infratemporal fossa is the space inferior to the ____.

Answer 1

Zygomatic arch

Zygomatic arch

Question 2

What are he boundaries of the infratemporal fossa?

Answer 2

Lateral: ramus of mandible

Anterior: maxilla

Medial: lateral pterygoid plate

Roof: sphenoid

Posterior: tympanic plate and mastoid and styloid process

Inferior: angle of mandible

Question 3

What are the four muscles of mastication?

Innervated by what?

Answer 3

Medial pterygoid m

Lateral pterygoid m

Masseter m

Temporalis m

Trigeminal N V3

Question 4

What are the contents of the infratemporal fossa?

Answer 4

Inferior potion of temporalis m

Lateral and medial pterygoid m

Maxillary A

Pterygoid venous plexus

Inferior alveolar N (V3)
Lingual N (V3)
Buccal N (V3)
Chorda tympani (CN VII)
Otic ganglion

Question 5

When you yawn, the ____ muscle contracts, expands, and pushes on pterygoid venous plexus to stimulate blood flow.

Answer 5

Lateral pterygoid m

Question 6

Where do the mandibular branches off the maxillary A go, what do they supply?

Deep auricular A

Anterior tympanic A

Inferior alveolar A

Middle meningeal A

Accessory meningeal A

Answer 6

External acoustic meatus; external TM, TMJ

Internal TM

Enters mandibular foramen and supplies mandible, mandibular teeth, chin, and mylohyoid m

Enters cranium via foramen spinosum, supplies dura mater of lateral wall, trigeminal ganglion, facial N, geniculate ganglion, tympanic cavity, tensor tympani m

Enters cranium via foramen ovale and supplies extracranial muscles of infratemporal fossa, otic ganglion, and sphenoid bone

Question 7

What do the pterygoid branches off the maxillary A supply?

Masseteric A

Pterygoid branches

Deep temporal A

Buccal A

Answer 7

TMJ, masseter m

Pterygoid m

Temporalis m

Buccal fat pad, buccinator, buccal and oral mucosa

Question 8

What are five sensory branches off of V3?

Answer 8

Buccal

Lingual

Inferior alveolar: dental, incisive, mental

Auriculotemporal: anterior auricular, external acoustic meatus, temporomandibular joint, superficial temporal

Meningeal: anterior cranial fossa, middle cranial fossa

Question 9

What are five motor branches off of V3?

Answer 9

Medial pterygoid: tensor veli palatini, tensor tympani

Lateral pterygoid

Masseteric

Deep temporal

Mylohyoid: N to mylohyoid, N to anterior digastric

Question 10

What are six sensory branches of V2?

Answer 10

Zygomatic
Infraorbital
Superior alveolar 
Nasociliary 
Palatine
Meningeal

Question 11

What is the fx of the sphenomandubular L?

____ ligament also limits the inferior excursion at the TMJ. What arch is it from?

Answer 11

Prevents dislocation of the mandible

Stylomandibular L; Brachial arch 1

Question 12

What is the origin, insertion, innervation, and action of the masseter m?

Answer 12

Zygomatic bone

Mandibular angle and ramus

Masseteric N (V3)

Elevates mandible, assists in protraction, retraction, side to side motion, closes jaw*

Question 13

What is the origin, insertion, innervation, and action of the temporalis m?

Answer 13

Temporal fossa/fascia

Coronoid process of mandible

Deep temporal N (V3)

Elevate mandible, retract mandible, lateral movement

Question 14

The _____ is the only opener of the jaw. The other muscles of mastication close the jaw.

Answer 14

Lateral pterygoid m

Question 15

_____ innervates buccinator m and orbicularis oris m, which assist in mastication.

Answer 15

Facial N

Question 16

What is the origin, insertion, innervation, and action of the lateral pterygoid m?

Answer 16

Greater wing of sphenoid bone; lateral pterygoid plate

Mandible, TMJ

Lateral pterygoid N (V3)

Protrudes mandible, opens mouth, side to side movement

Question 17

What is the origin, insertion, innervation, and action of the medial pterygoid m?

Answer 17

Maxilla, palatine bone, medial surface of lateral pterygoid plate, pterygoid fossa

Pterygoid rugosity on mandibular angle

Medial pterygoid N (V3)

Elevates mandible, protrusion of mandible, medial movement toward opposite side, side to side, closes jaw

Question 18

_____ muscles fix the hyoid in place so the ____ muscles can help open the mandible.

What are the four infrahyoid muscles fixing the hyoid?

What are the four suprahyoid muscles assisting in opening the jaw?

Answer 18

Infrahyoid

Suprahyoid

Sternohyoid, sternothyroid, thyrohyoid, omohyoid

Digastric (V3, CN VII), geniohyoid (C1), mylohyoid (V3), stylohyoid (CN VII)

Question 19

Name the muscle with the movement of the mandible:

Elevation

Depression

Protrusion

Retrusion

Lateral movements

Answer 19

Temporalis, masseter, medial pterygoid

Lateral pterygoid, suprahyoid and infrahyoid muscles

Lateral pterygoid, masseter, medial pterygoid

Temporalis, masseter

Ipsilateral temporalis and masseter, contralateral pterygoids

Question 20

The TMJ join is a ____ with a ____ disc. ____ muscle attaches to this disc.

This joint can become ____.

Answer 20

Synovial joint (with synovial fluid and membrane)

Articular disc

Lateral pterygoid m

Arthritic

Question 21

____ 15 degrees, the TMJ stays in the same place and rotates the glenoid.

____ 15 degrees the TMJ dislocates and drops onto the anterior process. The articular disc slides with the joint, pulled by the ____. Dysfunction when the superior head of this muscle is not working.

Answer 21

Less than

Greater than

Lateral pterygoid m

Question 22

Sensation to the TMJ is done by _____ nerves.

Answer 22

Auriculotemporal N (V3)

Posterior deep temporal N (V3)

Masseteric N (V3)

Question 23

Posterior dislocation of the TMJ is hard because it runs into the ___.

Anterior dislocation is common; the TMJ pops forward into the _____.

Answer 23

Tympanic plate

Infratemporal fossa

Question 24

How do you anesthetize the bottom teeth?

How do you anesthetize the top teeth?

Answer 24

Inject above bottom 3rd molar to block inferior alveolar N

Inject above top 2nd molar, 2nd premolar, and incisive foramen to block superior alveolar N; also can block superior labial N (supplying the gum)