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Flashcards in Cranial Nerves Deck (18):
1

Name the 12 cranial nerves

CNI Olfactory
CNII Optic
CNIII Oculomotor
CNIV Trochlear
CNV Trigeminal
CNVI Abducent
CNVII Facial
CNVIII Vestibulocochlear
CNIX Glossopharyngeal
CNX Vagus
CNXI Accessory
CNXII Hypoglossal

2

What are the 3 motor columns medial to lateral?

Somatic, Branchial, Visceral (autonomic)

3

What are the 3 sensory columns medial to lateral?

Visceral, Somatic, Special

4

What is the pupillary light reflex?

light is shone into the eye which sends signals from the retina via the optic nerve to the brain- motor fibres from the Edinger Westfal nucleus innervate the sphincter pupillae muscle which constricts the pupils

5

The pupillary light reflex is used to check which region of the brainstem?

midbrain

6

Describe the Corneal blink reflex

cotton wool is touched against the retina which is sensed by Opthalmic division of Trigeminal nerve CNV1 and motor response is mediated by Facial nerve CNVII triggering blinking of the eye (orbicularis oculi)

7

The Corneal blink reflex is used to assess function at what level of the brainstem?

Pons

8

Describe the gag reflex

Stimulation of the posterior tongue/oropharynx stimulates glossopharyngeal nerve (afferent) and triggers gag = mediated by the vagus nerve

9

The gag reflex is used to test function in what region of the brainstem?

Medulla

10

What are the somatic motor functions?

extra-ocular muscles, muscles of tongue

11

What are the branchial motor nuclei?

Trigeminal nucleus (mastication) Facial nucleus, nucleus ambiguus, Acessory nucleus

12

What is the edinger westfall nucleus?

Oculomotor nucleus -> for pupillary reflex

13

What nuclei are in the visceral motor column?

EW-nucleus, Superior and inferior salivatory (CNVII, CNIX) Vagus nucleus

14

What nuclei are in the visceral sensory column?

CNVII, IX, X = Nucleus Solitarius

15

What nuclei are in the somatic sensory column?

CNV, VII, IX, X

16

What is the nuclei in the special sensory column

CNVIII

17

How is the nucleus solitarius organised?

Rostral = gustatory nucleus (taste buds and palate)
Caudal = visceral sensory division

18

Where does the olfactory nerve exit the skull? where does the neurons synapse?

from the nose it picks up smells and takes this info through the cribiform plate of the ethmoid bone and synapses in the olfactory bulb - info ends up in the insular cortex (gustatory nucleus)