Temporal and infratemporal fossae

Question 1

Movements of mandible

Answer 1

Depression
Elevation
Protrusion
Retraction

Question 2

Depression of mandible

Answer 2

Digastric, mylohyoid and geniohyoid.

Question 3

Elevation of mandible

Answer 3

Temporalis, masseter and medial pterygoid

Question 4

Protraction

Answer 4

Lateral pterygoid with some assistance of medial pterygoid

Question 5

Retraction

Answer 5

Geniohyoid and digastric

Question 6

Innervation of TMJ muscles

Answer 6

All muscles that move TMJ joints are innervated by V3, except for geniohyoid muscles

Question 7

Masseter

Answer 7

Origin: zygomatic arch and maxillary process of zygomatic bone
Inserts onto lateral surface of ramus of mandible

Question 8

Major contents of infratemporal fossa

Answer 8

Sphenomandibular ligament
Medial and lateral pterygoid muscles
Maxillary artery
Mandibular nerve
Branches of facial and glossopharyngeal nerve
Pterygoid plexus of veins

Question 9

Anterior trunk branches of mandibular nerve

Answer 9

Buccal, masseteric, deep temporal nerve, nerve to lateral pterygoid, all of which are sensory other than buccal

Question 10

Posterior trunk branches of mandibular nerve

Answer 10

Auriculotemporal, lingual, inferior alveolar, all of which are sensory other than nerve to mylohyoid (a branch from inferior alveolar nerve)

Question 11

Branches of mandibular nerve before dividing into anterior and posterior trunks

Answer 11

Meningeal branch (passes through foramen spinosum with middle meningeal artery)
Nerve to medial pterygoid (2 small branches - one for tensor veli palatini and another to tensor tympani)

Question 12

Auriculotemporal nerve

Answer 12

passes deep to parotid gland between TMJ and ear

Also delivers postganglionic parasympathetic nerves from CN 9 after otic ganglion to parotid gland

Question 13

Lingual nerve

Answer 13

Major sensory branch of V3
Carries sensation from anterior 2/3rd of tongue
Joined high in infratemporal fossa by chorda tympani (branch of facial nerve which carries taste from anteiror 2/3rds and parasympathetic fibers to all salivary gland below oral fissure)

Question 14

Inferior alveolar nerve

Answer 14

Sensory branch to all lower teeth and much of associated gingivae

One motor branch which innervates mylohyoid and anterior belly of digastric

Question 15

Lesser petrosal nerve

Answer 15

Carries mainly preganglionic parasympathetic fibers (from CN9) to otic ganglion destined for parotid gland

Passes through foramen ovale