Infratemporal Fossa Pt. 2

Question 1

The nervous structures of the infratemporal fossa include the

Answer 1

Mandibular nerve (CN V3), Chorda tympani nerve (CN VII), and Lesser petrosal nerve (CN XI)

-and octic ganglion

Question 2

The main nerve for general sensory innervation in the head and motor innervation to skeletal muscle derivatives of the 1st pharyngeal arch with its third division

Answer 2

Trigeminal nerve (more specifically mandibular nerve V3)

Question 3

Sensory pseudounipolar neurons make up the

trigeminal ganglion of the

Answer 3

Middle cranial fossa

Question 4

Each of the trigeminal’s 3 divisions exits through foramina in the

Answer 4

Middle cranial fossa

Question 5

CN V itself does not contain

Answer 5

Autonomic neurons

Question 6

However, all 4 parasympathetic cranial ganglia are associated with

-Travel on its branches

Answer 6

CN V

Question 7

The general sensory fibers of CN V1 (opthalmic nerve) are distributed to skin, mucosa, and conjunctiva of the

Answer 7

Front of the head and nose

Question 8

As the opthalmic nerve exits the cranium and enters the orbit via the superior orbital fissure, it branches into the

Answer 8

Nasociliary, frontal, and lacrimal nerves

Question 9

In the orbit, CN V1 is associated with the parasympathetic ciliary ganglion whose axons extend to supply the

Answer 9

Pupillary constrictor and Ciliary muscles

Question 10

How do you test the function of CN V1?

Answer 10

Corneal reflex

-touch the cornea and evoke a reflexive blink

Question 11

Provides sensation from cornea

Answer 11

CN V1

Question 12

Provides motor control to orbicularis oculi

Answer 12

CN VII

Question 13

Conveys sensation for skin and mucosa associated with the upper jaw

Answer 13

CN V2 (maxillary nerve)

Question 14

In the pterygopalatine fossa, CN V2 is associated with the parasympathetic pterygopalatine ganglion whose axons extend along branches of CN V2 and CN V1 to innervate the

Answer 14

Lacrimal gland in the orbit

Question 15

CN V! and CN V2 are purely

Answer 15

Sensory

Question 16

Serves are both sensory for the LOWER jaw region and motor for some skeletal muscles of the head

Answer 16

CN V3 (mandibular nerve)

Question 17

CN V3 leaves the middle cranial fossa via the

Answer 17

Foramen ovale

Question 18

All branches of the infratemporal nerve originate in the

Answer 18

Infratemporal fossa

Question 19

The sensory buccal branch is from

Answer 19

CN V3

Question 20

The motor innervation to the buccinator is from

Answer 20

CN VII

Question 21

A sensory branch of CN V3 that encircles the middle meningeal artery and wraps around the neck of the mandible

Answer 21

Auriculotemporal nerve

Question 22

Distributed to the TMJ, parotid sheath, external ear, tympanic membrane, and skin over the temple

Answer 22

Auriculotemporal nerve

Question 23

Carries parasympathetic postganglionic fibers from the octic ganglion to the parotid gland

Answer 23

Auriculotemporal nerve

Question 24

Conveys general sensation from the anterior ⅔ of the tongue, oral mucosa on floor of oral cavity, lingual gingiva of mandibular teeth

Answer 24

Lingual nerve of V3

Question 25

Special gustatory/taste sensation from the anterior | ⅔ of the tongue is carried by sensory fibers in the

Answer 25

Chorda Tympani (CN VII)

Question 26

Joins the lingual nerve in the infratemporal fossa and travels along the lingual nerve to the tongue in the oral cavity

Answer 26

Chorda Tympani (from CN VII)

Question 27

Cross the lateral surface of the medial pterygoid into the oral cavity inferior to the LAST molar tooth

Answer 27

Lingual nerve and Chorda tympani

Question 28

The lingual nerve and sensory fibers of chorda tympani pass into the

Answer 28

Tongue

Question 29

Presynaptic parasympathetic fibers in the chorda tympani pass into and synapse on the

Answer 29

Submandibular ganglion (on the floor of the oral cavity) -for secremotor activation

Question 30

Presynaptic parasympathetic fibers in the chorda tympani pass into and synapse on the submandibular ganglion (on the floor of the oral cavity) for secremotro activation of the

Answer 30

Submandibular and Sublingual glands

Question 31

Lingual nerve injury proximal to where chorda tympani joins in the infratemporal fossa produces

Answer 31

Ipsilateral loss of general sensation to the anterior 2/3 of the tongue, oral mucosa, and gingivae

Question 32

Injury distal to the union of the chorda tympani and lingual nerve in the infratemporal fossa results in

Answer 32

Ipsilateral general sensory loss PLUS loss of secretion from submandibular-sublingual salivary glands -and loss of taste from anterior 2/3 of tongue

Question 33

Mostly msensory nerve that gives off a motor branch right before it enters the mandibular foramen through the mandibular canal

Answer 33

Inferior alveolar nerve

Question 34

The inferior alveolar nerve gives off a motor branch to the

Answer 34

Mylohyoid and anterior belly of digastric

Question 35

In the mandibular canal, branches of the inferior alveolar nerve supply the sensation for the

Answer 35

Mandibular teeth

Question 36

The inferior alveolar nerve then pierces the mandibles anterior aspect via the mental foramen to supply sensation for the

Answer 36

Chin

Question 37

Anesthetizes all mandibular teeth to the median plane and skin-mucosa of the chin and lower lip

Answer 37

An inferior alveolar nerve block

Question 38

Accidental deep injection into the medial pterygoid during an inferior alveolar nerve block would temporarily affect the ability to

Answer 38

Open the mouth (due to pterygoid trismus)

Question 39

Supply most of the muscles of f the first pharyngeal arch: muscles that move the mandible (muscles of mastication and some suprahyoids) and tensor muscles (tensor tympani in the middle ear and tensor veli palatini of the soft palate)

Answer 39

Motor branches of the mandibular nerve (CN V3)

Question 40

Both the middle ear (tympanic cavity) and infratemporal fossa are associated with components of the autonomic motor supply to the

Answer 40

Major salivary glands

Question 41

To reach the parotid gland with parasympathetic innervation, Presynaptic neuron cell bodies originate in salivary nuclei of the brainstem with axons extending through

Answer 41

CN IX

Question 42

As CN IX exits the cranium via the jugular foramen, its tympanic nerve branches through a small canaliculus to enter the

Answer 42

Middle ear in the petrous parts of temporal bone

Question 43

In the middle ear, the tympanic nerve forms the tympanic plexus, which gives rise to the

Answer 43

Lesser petrosal nerve

Question 44

The lesser petrosal nerve (of CN IX) penetrates the roof of the tympanic cavity to enter the

Answer 44

Middle cranial fossa

Question 45

The lesser petrosal nerve then leaves the MCF with the mandibular enrve via the foramen ovale to enter the infratemporal fossa where it synapses in the

Answer 45

Octic ganglion

Question 46

Axons from neuron cell bodies in the octic ganglion travel along the

Answer 46

Auriculotemporal nerve to the parotid gland

Question 47

Located in the external carotid nerve plexus and the activity of these fibers may REDUCE secretion from the gland -apparent as dry mouth when nervous

Answer 47

Sympathetic post synaptic fibers (from cell bodies in cervical ganglia)

Question 48

To reach the submandibular and sublingual glands with parasympathetic innervation, Presynaptic neuron cell bodies originate in the brainstem salivary nuclei with axons extending through

Answer 48

CN VII

Question 49

As CN VII travels through the internal acoustic meatus and facial canal, the chorda tympani branches through the middle ear MEDIAL to

Answer 49

The handle of the malleus (attached to tympanic membrane)

Question 50

The chorda tympani then leaves the middle ear via the Petrotympanic fissure (between tympanic and petrous parts of temporal bone) to enter the

Answer 50

Infratemporal fossa

Question 51

Once in the infratemporal fossa, the chorda tympani decends to join the

Answer 51

Lingual nerve

Question 52

Contains both special sensory taste fibers conveying taste from the ANTERIOR 2/3 of the tongue and parasympathetic presynaptic fibers

Answer 52

Chorda tympani

Question 53

Parasympathetic presynaptic fibers of the chorda tympani (CN VII) synapse in the -hanging off the lingual nerve in the floor of theoral cavity

Answer 53

Submandibular ganglion

Question 54

Post synaptic parasympathetic axons then extend to activate secretion of

Answer 54

Submandibular-sublingual glands

Question 55

The superior boundary of infratemporal fossa is the greater wing of the sphenoid, which contains the

Answer 55

Foramen Ovale and Foramen Spinosum

Question 56

Permits passage of the mandibular nerve and lesser petrosal nerve from the middle cranial fossa into the infratemporal fossa

Answer 56

Foramen Ovale

Question 57

Permits passage of the middle meningeal artery from the infratemporal fossa to the middle cranial fossa

Answer 57

Foramen spinosum

Question 58

The parietal, frontal, greater wing of sphenoid, squamous part of temporal meet at a weak area of the skull called the

Answer 58

Pterion

Question 59

Located two fingers breadth superior to the zygomatic arch and one fingers beadth posterior to the frontal process of zygomatic bone

Answer 59

Pterion

Question 60

Fracture of the pterion may rupture the underlying

Answer 60

Frontal branch of middle meningeal artery

Question 61

Inferiorly, the medial pterygoid muscle attaches to the

Answer 61

Medial aspect of the mandible ramus (near its angle)

Question 62

The lateral boundary of the infrtemporal fossa is the

Answer 62

Medial surface of the ramus of mandible

Question 63

The medial surface of the ramus of the mandible contains the mandibular foramen that transmits the

Answer 63

Inferior alveolar nerve and artery (of maxillary artery)

Question 64

The medial surface of the ramus of the mandible, which contains the mandibular foramen that transmits the inferior alveolar nerve (of CN V3) and artery (of maxillary artery) out of the infratemporal fossa and through the mandible to eventually exit through the mental foramen as the

Answer 64

Mental nerve and artery of the chin

Question 65

The medial wall of the infratemporal fossa is the

Answer 65

Lateral pterygoid plate of the sphenoid

Question 66

The anterior wall of the infratemporal fossa is the

Answer 66

Posterior surface of the maxilla

Question 67

Lies between the medial and anterior walls of the infratemporal fossa and it allows for communication between the infratemporal fossa and the deeper, more medial pterygopalatine fossa

Answer 67

Pterygomaxillary fissure

Question 68

Passes from the infratemporal fossa to the pterygopalatine fossa via the pterygomaxillary fissure

Answer 68

The third (most distal) part of the maxillary artery

Question 69

The posterior wall of the infratemporal fossa is formed by the

Answer 69

Tympanic plate, styloid process, and the mastoid process of the temporal bone