Infratemporal Fossa

Question 1

parotid region

Answer 1

1) traversing the facial nerve
- CN VII enters ITF via the stylomastoid foramen
2) common carotid
- reaches TMJ and external terminated to sup. temporal and maxillary artery
3) pterygoid venous plexus
- retromandibular vein traverses the gland and also joins external jugular

Question 2

innervation of temporal fossa

Answer 2

1) auriculotemporal nerve
- from V3
- temporal fossa
2) splits around middle meningeal artery

Question 3

innervation of parotid gland

Answer 3

1) GSA: auriculotemporal nerve V3 and great auricular C2-C3
2) GVE:
- sympathetic traveling via arteries
- parasympathetic from CN IX to otic ganglion/V3 then auriculotemporal nerve

Question 4

parotid gland supplies

Answer 4

25% of salivary volume

Question 5

masticator space

Answer 5

1) includes the temporal and infratemporal fossae

Question 6

infratemporal fossa contents

Answer 6

1) muscles of mastication
2) V3 of trigeminal nerve
3) chorda tympani branch of facial nerve
4) maxillary artery and vein

Question 7

masticator space fascia

Answer 7

1) derived from investing later of deep cervical fascia
- encapsulates the parotid
2) envelopes the mandible and muscles of mastication
3) includes branches of CN V and the maxillary artery and vein

Question 8

superficial muscles of mastication

Answer 8

1) temporalis
- temporal fossa to coronoid process
- extends to ramus of the mandible on medial side
- closing and retrusion
2) masseter
- zygomatic arch to the ramus of the mandible
- closing

Question 9

deep muscles of mastication

Answer 9

1) medial pterygoid
- deep lateral pterygoid plate of sphenoid to medial surface of mandibular ramus (lower half)
- strong elevator and protrusion
- lateral movement as well
2) lateral pterygoid
- superficial lateral pterygoid plate of sphenoid to maxilla
- protrusion and depression
—
a nerve bundle emerges between

Question 10

pterygomandibular raphae

Answer 10

1) site for anesthesia

Question 11

injecting into parotid gland

Answer 11

1) facial paralysis since CN VII is in there
2) temporary

Question 12

buccinator

Answer 12

1) pushes food back to center while chewing

Question 13

V3 division of CN V

Answer 13

1) origin to the maxillary and mandibular arches and the muscles of mastication

Question 14

innervation of superficial face

Answer 14

1) sensory CN V
- from 1st branchial arch
2) motor CN VII
- from 2nd branchial arch
- facial nerve

Question 15

trigeminal ganglion

Answer 15

1) lies within the middle cranial fossa
2) equivalent to dorsal root ganglion
- nerve cell bodies (no synapse)
- pseudounipolar

Question 16

nuclei of trigeminal pathway

Answer 16

1) motor
2) mesencephalic
3) pontine / principal
4) spinal trigeminal

Question 17

motor nuclei

Answer 17

1) masticatory muscles
2) motor component

Question 18

mesencephalic

Answer 18

2) proprioception from muscles of mastication

Question 19

principal / pontine

Answer 19

1) touch from face
2) sensory

Question 20

spinal trigeminal

Answer 20

1) touch, pain, temperature from face
2) sensory

Question 21

jaw jerk reflex arc

Answer 21

1) proprioceptive fibers from masticatory muscles, TMJ, and PDL travel in the motor root
2) proprioceptive nerve cells bodies in the mesencephalic nucleus
3) some of these synapse in the nerve cell bodies of the trigeminothalamic tract, sensory to the brain
4) however, some of these synapse onto motor nerve cell bodies in the motor nucleus
5) monosynaptic reflex arc

Question 22

V3 short stem, then splits into 2 division

Answer 22

1) stem
- medial pterygoid nerve
- tensor tympani nerve
- tensor palatini nerve
- meningeal branch

Question 23

V3 anterior division

Answer 23

1) motor division
- deep temporal nerves (2)
- masseteric nerve
- lateral pterygoid nerve
2) one sensory branch
- long buccal nerve

Question 24

V3 posterior division

Answer 24

1) sensory
- auriculotemporal
- lingual nerve
- inferior alveolar (mylohyoid, mental, incisive)
2) all sensory except mylohyoid nerve

Question 25

additional innervation in the infratemporal fossa

Answer 25

1) chorda tympani - branch of CN VII - caries taste fibers from anterior tongue - secretomotor fibers to salivary glands 2) joins lingual nerve of V3 in ITF

Question 26

blood supply to infratemporal fossa

Answer 26

1) maxillary artery - mandibular - pterygoid - pterygopalatine

Question 27

mandibular portion of maxillary artery

Answer 27

1) deep auricular 2) anterior tympanic 3) middle meningeal 4) accessory meningeal 5) inferior alveolar* - mylohyoid, mental, and incisive branches - primary blood supply to mandible

Question 28

pterygoid branch

Answer 28

1) deep temporal 2) medial pterygoid 3) lateral pterygoid 4) masseteric 5) buccal

Question 29

pterygopalatine

Answer 29

1) posterior superior alveolar 2) infraorbital 3) artery of pterygoid canal 4) pharyngeal branch 5) descending palatine 6) sphenopalatine

Question 30

pterygoid venous plexus

Answer 30

1) primary drainage to maxillary vein 2) connections to - cavernous sinus - facial vein - inferior ophthalmic - pharyngeal plexus