Lecture 22 - Skull and Cranial Nerves II Flashcards Preview

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Flashcards in Lecture 22 - Skull and Cranial Nerves II Deck (41):
1

What is CN I?

Olfactory n.

2

What information does CN I carry?

Olfactory information back to piriform

3

What are the three parts of the olfactory n.?

Olfactory filaments - bulb - tract

4

Where do CN I nerves enter?

Anterior cranial fossa via cribriform plate

5

What are vomeronasal ducts?

Associated with the flehmen reaction, pheromone detection

6

What is CN II?

Optic nerve

7

What are the three parts to the optic nerve?

Optic nerve - chiasm - tract

8

What infomation does CN II carry?

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

9

What is contained within the optic nerve?

Fibers from one eye

10

What is contained within the optic chiasm?

Fibers from nasal retina of each eye

11

What is contained within the optic tract?

Ipsilateral temporal retinal fibers and contralateral nasal retina fibers

12

What is CN III?

Oculomotor n.

13

What information is carried within CN III?

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

14

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

Ventral oblique
Ventral, medial, dorsal recti
Levator palpebrae superioris

15

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

Ciliary muscles
Pupillary sphincter

16

What do the PNS do to the eye?

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

17

What is CN IV?

Trochlear

18

What does the CN IV do?

Provide motor innervation to dorsal oblique muscle

19

What is CN V?

Trigeminal

20

What are the branches of CN V?

1 - opthalmic
2 - maxillary
3 - mandibular

21

What is the function of CN V?

Provide sensory innervation to the face

22

What does the CN V3 do specifically?

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

23

What do the CN V branches exit from?

Trigeminal ganglion

24

What is CN VI?

Abducent

25

What is the function of CN VI?

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

26

What is CN VII?

Facial n.

27

What is the SNS function of CN VII?

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

28

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

CN V3

29

What is the PNS function of CN VII?

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

30

What is CN VIII?

Vestibulocochlear n.

31

What is the function of CN VIII?

Vestibular apparatus - balance
Cochlea - hearing

32

Where does CN VIII enter?

Temporal bone with facial nerve at the internal acoustic meatus

33

What is CN IX?

Glossopharyngeal

34

What is the function of CN IX?

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

35

What is CN X?

Vagus n.

36

What SNS functions does CN X have?

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

37

What PNS functions does CN X have?

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

38

What is CN XI?

Accessory n.

39

What muscles does CN XI innervate?

Brachiocephalicus, omotransversarius, sternocephalicus, and trapezius

40

What is CN XII?

Hypoglossal n.

41

What is the function of CN XII?

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