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Flashcards in Cranial Nerves Deck (54)
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1

What do cranial nerves supply?

Supply somatic and visceral motor and sensory information to the head

CN IX and X supply visceral sensory and motor innervation to neck, chest and abdomen

2

Which two cranial nerves are different to the rest in terms of the strucutres that they innervate?

CN IX and X

Supply visceral sensory and motor innervation to neck, chest and abdomen

3

List the cranial nerves?

4

Which cranial nerves are purely sensory?

Which are purely motor?

Which are mixed?

Sensory: 1, 2, 8

Motor: 3, 4, 6, 11, 12

Mixed/both: 5, 7, 9, 10

Some say money matters but my brother says big boobs matter most

5

What are cranial nerves connected to centrally?

Cranial nerve nuclei

6

Describe the broad organisation of cranial nerve nuclei?

Organised rostrally to caudally

Roughly organised in order of target tissues

 

7

Which cranial nerve nuclei are located in the brainstem?

Nuclei 3-12

8

How are the cranial nerve nuclei arranged in the brainstem?

6 columns either side of midline

Motor nuclei are located in the 3 columns close to midline

Sensory nuclei are located in the 3 lateral columns 

9

Where are the motor nerve nuclei located in the brainstem?

3 columns close to midline

10

What are the three motor columns located in the brainstem?

Medial to lateral:

Somatic

Branchial

Visceral

11

Which cranial nerve nuclei are in the somatic motor column? Where in the brainstem are these nuclei located?

Extra-ocular muscles: CN 3, 4, 6

Tongue muscles: CN 12

12

Which cranial nerve nuclei are located in the branchial motor column? Where in the brainstem are they located?

Muscles of mastication: CN 5 (V3)

Muscles of facial expression: CN 7

Muscles of pharynx and larynx: CN 9, 10

13

What is the nucleus ambiguus? Where is it located?

Mostly a motor nucleus

Lies behind inferior olive in medulla

Contains nuclei of CN IX (stylopharyngeus) and X (levator palati)

14

Which cranial nerve nuclei lie in the visceral efferents motor column? Where in the brainstem are they located?

Motor innervation to smooth muscles: CN 3, 7, 9, 10

15

Where are the sensory nerve nuclei located?

In lateral 3 columns 

16

What are the three sensory columns located in the brainstem?

Medial to lateral:

Visceral sensory

Somatic sensory

Special sensory

17

Which cranial nerve nuclei are located in the visceral sensory column? Where in the brainstem are they located?

Taste: CN 7, 9, 10

Autonomic: CN 9, 10

18

What is the Nucelus Solitarius? Describe its arrangement?

Nucelus for visceral sensation

Extends from pons to nucleus gracilis

Rostral: gustatory nucleus

Caudal: visceral sensory division

19

Which cranial nerve nuclei are in the somatic sensory column of the brainstem? Where are they located?

Sensation to face, mucosa of nose and mouth, cranial dura: CN 5

Skin behind ear and lining of EAM: CN 7, 9, 10

20

Which cranial nerve nuclei are located in the special sensory column of the brainstem? Where in the brainstem are they located?

Hearing and equilibrium: CN 8 

21

Which cranial nerve nuclei arise from the midbrain? Which from the pons? Which from the medulla?

Rule of fours:

Midbrain: 3, 4

Pons: 5, 6, 7, 8

Medulla: 9, 10, 11, 12

22

Describe the locations of all of the cranial nerve nuclei in the brainstem and spinal cord?

23

Describe the olfactory nerve?

Sense of smell

Exits skull at cribiform plate

24

Describe the optic nerve?

Sight

Exits at optic canal

Formed from axons of ganlion cells in the retina

25

What is the optic nerve formed from?

Axons of ganglion cells in the retina

26

Describe the nerves of ocular motion?

CN 3, 4, 6

CN III innervates 4

CN IV innervates superior oblique

CN VI innervates lateral rectus 

Act in a coordinated fashion to move the eyes

Exit skull at SOF

27

Describe the oculomotor nerve?

Motor: Innervates 4 extraocular muscles and elevates eyelid

PS: Innervates iris and ciliary muscle

Exits skull at SOF

28

Describe the passage of the nerves of ocular motion?

All 3 go through cavernous sinus and SOF

4 and 6 go through common tendinous ring 

29

Which nerves exit the skull via the SOF?

3, 4, 6, V1

30

Describe the groups that cranial nerves exit the skull in? Why is this signifcant?

Nerves that exit the skull together will be affected by disease together