Lecture 22 - Skull and Cranial Nerves II

Question 1

What is CN I?

Answer 1

Olfactory n.

Question 2

What information does CN I carry?

Answer 2

Olfactory information back to piriform

Question 3

What are the three parts of the olfactory n.?

Answer 3

Olfactory filaments - bulb - tract

Question 4

Where do CN I nerves enter?

Answer 4

Anterior cranial fossa via cribriform plate

Question 5

What are vomeronasal ducts?

Answer 5

Associated with the flehmen reaction, pheromone detection

Question 6

What is CN II?

Answer 6

Optic nerve

Question 7

What are the three parts to the optic nerve?

Answer 7

Optic nerve - chiasm - tract

Question 8

What infomation does CN II carry?

Answer 8

Information from the retinal ganglion cells to the lateral geniculate nucleus of the thalamus

Question 9

What is contained within the optic nerve?

Answer 9

Fibers from one eye

Question 10

What is contained within the optic chiasm?

Answer 10

Fibers from nasal retina of each eye

Question 11

What is contained within the optic tract?

Answer 11

Ipsilateral temporal retinal fibers and contralateral nasal retina fibers

Question 12

What is CN III?

Answer 12

Oculomotor n.

Question 13

What information is carried within CN III?

Answer 13

Provides motor innervation to several extrinsic muscles that move the eye
Parasympathetic innervation to two intrinsic muscles of the eye

Question 14

What are the actual muscles in the eye that the oculomotor neuron innervates?

Answer 14

Ventral oblique
Ventral, medial, dorsal recti
Levator palpebrae superioris

Question 15

What are the actual muscles in the eye that CN III provides PNS innervation?

Answer 15

Ciliary muscles

Pupillary sphincter

Question 16

What do the PNS do to the eye?

Answer 16

Cause the lens to become rounder and the pupil diameter to decrease

Question 17

What is CN IV?

Answer 17

Trochlear

Question 18

What does the CN IV do?

Answer 18

Provide motor innervation to dorsal oblique muscle

Question 19

What is CN V?

Answer 19

Trigeminal

Question 20

What are the branches of CN V?

Answer 20

1 - opthalmic
2 - maxillary
3 - mandibular

Question 21

What is the function of CN V?

Answer 21

Provide sensory innervation to the face

Question 22

What does the CN V3 do specifically?

Answer 22

Motor innervation to the muscles of mastication and muscles in the ear, pharynx with tensor in the name

Question 23

What do the CN V branches exit from?

Answer 23

Trigeminal ganglion

Question 24

What is CN VI?

Answer 24

Abducent

Question 25

What is the function of CN VI?

Answer 25

Provide motor innervation to lateral rectus and retractor bulbi of the eye

Question 26

What is CN VII?

Answer 26

Facial n.

Question 27

What is the SNS function of CN VII?

Answer 27

Motor innervation to muscles of facial expression | Taste to anterior 2/3 of the tongue

Question 28

What provides general sensory to the anterior 2/3 of the tongue?

Answer 28

CN V3

Question 29

What is the PNS function of CN VII?

Answer 29

Innervation to pterygopalatine ganglion Nasal mucosa - mucus production Lacrimal gland - tear production

Question 30

What is CN VIII?

Answer 30

Vestibulocochlear n.

Question 31

What is the function of CN VIII?

Answer 31

Vestibular apparatus - balance | Cochlea - hearing

Question 32

Where does CN VIII enter?

Answer 32

Temporal bone with facial nerve at the internal acoustic meatus

Question 33

What is CN IX?

Answer 33

Glossopharyngeal

Question 34

What is the function of CN IX?

Answer 34

Motor innervation to stylopharyngeus Parotid gland Taste to posterior 1/3 of tongue Sensation to post. 1/3 of tongue, oropharynx, middle ear, auditory tube, carotid sinus, and carotid body

Question 35

What is CN X?

Answer 35

Vagus n.

Question 36

What SNS functions does CN X have?

Answer 36

Motor to muscles of soft palate (except tensor veli palatini), palatoglossus, pharynx, and larynx

Question 37

What PNS functions does CN X have?

Answer 37

Cardiac muscle, viscera to left colic fissure | Taste buds around epiglottis, external acoustic meatus, dura mater in dorsal cranial fossa

Question 38

What is CN XI?

Answer 38

Accessory n.

Question 39

What muscles does CN XI innervate?

Answer 39

Brachiocephalicus, omotransversarius, sternocephalicus, and trapezius

Question 40

What is CN XII?

Answer 40

Hypoglossal n.

Question 41

What is the function of CN XII?

Answer 41

Motor innervation to almost all of the intrinsic and extrinsic tongue muscles