Cranial Innervations&BitchHikers

Question 1

General Motor Fibers of Trigeminal - CN V3 innervate which muscles?

Answer 1

Tensor Tympani - ear: dampens sound
Muscles of Massttication
-Temporalis
-Masseter
-Medial Pterygoid
-Lateral Pterygoid

Question 2

Inferior Alveolar Nerve: sensory, motor, or both? Where does it come from? What does it do?

Answer 2

Both.
From V3 Trigeminal.
Sensory: Sensation of skin over the lower jaw, side of the head, lower teeth, oral cavity.

Motor:
-Mylohyoid
-Ant. Digastric

Question 3

CN V3 branches into which sensory nerves.

Answer 3

Auriculotemporal N.
Lingual N.
Inferior Alveolar N.

Question 4

Lingual Nerve comes from what nerve? What is its function?

Answer 4

From Trigeminal V3. The sensation of Ant 2/3 of the tongue.

Question 5

Auriculortemporal N comes from what nerve and does what?

Answer 5

Trigeminal V3 - ???

Question 6

What makes up Chorda Tympani

Answer 6

CN VII - Facial Nerve sensation and parasympathetic fibers

Question 7

Who does Chorda Tympani catch a ride with

Answer 7

Lingual Nerve of V3

Question 8

Chorda Tympani relays what sensory information

Answer 8

Taste of anterior 2/3 of the tongue via facial nerve sensory fibers

Question 9

Chorda Tympani parasympathetic fibers innervate which glands - what is its effect

Answer 9

Submandibular and Sublingual Glands
Saliva Production

Question 10

If the Lingual Nerve is injured - what are the effects

Answer 10

No sensation or taste
No saliva production from submandibular and sublingual glands

Question 11

If Chorda Tympani is injured - what are the effects

Answer 11

No taste or saliva production of sublingual and submandibular glands.

Sensation INTACT via lingual

Question 12

What nerve is the target for local anesthetic in dental procedures? Why is the tongue also usually affected?

Answer 12

Inferior Alveolar Nerve. Also commonly hits lingual nerve.

Question 13

General Sensation of Lacrimal Gland is from?

Answer 13

Trigeminal V1 via the lacrimal nerve

Question 14

Parasympathetic activation of the Lacrimal Gland and Nasal Glands is from?

Answer 14

Parasympathetic Greater Petrosal Nerve of facial nerve (CN VII) that catches a ride on Trigeminal V2(?)

Question 15

What is the parasympathetic ganglion in the eye associated with the oculomotor nerve?

Answer 15

Ciliary Ganglion

Question 16

Oculomotor has what parasympathetic effects on the eye?

Answer 16

parasympathetic innervation to muscles of iris and ciliary muscles controlling lens shape
- Near Vision accommodation

Question 17

Trochlear Nerve (CN IV) does what?

Answer 17

Innvervates Superior Oblique muscle

Question 18

What are the two branches of the CN V1?

Answer 18

Lacrimal Nerve
Frontal Nerve

Question 19

Lacrimal nerve does?

Answer 19

Sensation to lacrimal gland and eyelid

Question 20

Frontal Nerve does?

Answer 20

Sensory innervation to orbit, skin of forehead

Question 21

CN V2 innervates?

Answer 21

Sensation of skin of face over upper jaw, upper teeth, inferior/posterior nasal cavity, hard palate in oral cavity

Question 22

Branches of CN V2

Answer 22

Infraorbital Nerve
Palatine Nerves

Question 23

Function of Palatine Nerves

Answer 23

Sensation in posterior nasal cavity, roof of mouth

Question 24

CN V2 parasympathetics come from? What nerve does the parasympathetic activation?

Answer 24

Greater Petrosal of Facial Nerve (CN VII)
PSNS of Lacrimal and Nasal Glands

Question 25

All trigeminal branches share one common sensory innveration, which is?

Answer 25

Dura Mater

Question 26

The function of cranial nerve 6. CN VI.

Answer 26

Motor to lateral rectus muscle in orbit

Question 27

Facial Nerve has motor innervations to which muscles?

Answer 27

Muscles of Facial Expression: Frontalis Oribicularis Oculi Orbicularis Oris Buccinator 1 Ear Muscle: Stapedius. 3 Neck Muscles: Platysma Stylohyoid Post. Digastric

Question 28

Function of Stapedius Muscle

Answer 28

Pulls stapes off oval window - diminished sound transmission

Question 29

Special Sensation function of facial nerve

Answer 29

Taste of ant. 2/3 of tongue. Runs with parasympathetic fibers to form chorda tympani

Question 30

Where does the facial nerve exit the skull

Answer 30

Stylomastoid foramen

Question 31

Function of CN VIII - Vestibulocochlear

Answer 31

Balance (Semicircular canals) Hearing (Cochlea)

Question 32

Somatic Sensation innervations of CN IX - glossopharyngeal

Answer 32

Taste and general sensation to posterior 1/3 of tongue, soft palate, and pharynx near tongue, general sensation of tympanic cavity, tympanic membrane, auditory tube.

Question 33

Motor innervation of CN IX - glossopharyngeal

Answer 33

Stylopharyngeus Muscle

Question 34

Parasympathetics of CN IX - glossopharyngeal

Answer 34

- parasympathetic innervation to the parotid gland via the Lesser Petrosal Nerve by hitchhiking on V3 -innervates carotid sinus/body with parasympathetic fibers

Question 35

Visceral Sensations of CN IX - Glossopharyngeal

Answer 35

visceral sensory innervation of carotid bifurcation for blood pressure control

Question 36

Special sensory innervation of CN X - Vagus

Answer 36

Special sensory innervation of taste to palate/epiglottis

Question 37

General Sensory Innervations of CN X - Vagus

Answer 37

General sensory innervation from epiglottis, larynx.

Question 38

Visceral Sensory Innervation of CN X - Vagus

Answer 38

Visceral sensory innervation to GI tract, thorax, and abdomen.

Question 39

Motor innervations of CN X - Vagus

Answer 39

Somatic motor innervation to pharynx, larynx, palatal muscles.

Question 40

Parasympathetic motor innervations of CN X - Vagus

Answer 40

Parasympathetic motor innervation to GI tract, thorax, abdomen.

Question 41

CN XI innervates?

Answer 41

Motor innervation to sternocleidomastoid and trapezius

Question 42

General function of CN XII

Answer 42

Intrinsic and Extrinsic tongue muscle movement

Question 43

Where can you see CN XII

Answer 43

Visible in neck just superior to carotid bifurcation