Lecture 8: Cranial nerves

Question 1

Name the 12 cranial nerve?

Answer 1

1. Olfactory
2. Optic
3. Occulomotor
4. Trochlear
5. Trigeminal
6. Abducens
7. Facial
8. Vesibulocochlear
9. Glossopharyngeal
10. Vagus
11. Accessory
12. Hypoglossal

Question 2

Function and leaving point of cranial nerve I?

Answer 2

Cribriform plate of the ethmoid bone

sensory w links to the imbic system

First to notice issues when a person develops alzheimers or parkinsons

Question 3

Function and leaving point of cranial nerve II?

Answer 3

Sensory

Optic canal to the optic chiasm before the LGB

crosses over so eye damage depends on where the issues occurs

Question 4

Function and leaving point of cranial nerve III?

damage results in?

Answer 4

Superior orbital fissure

motor control of the superior, medial and inferior rectus as well as the inferior oblique

damage results in downwards abducted eye

Question 5

Function and leaving point of cranial nerve IV?

Answer 5

Motor cotrol of the superior oblique

Superior orbital fissure

Trochlear nerve palsy = downwards, inwards gaze

Question 6

Function and leaving point of cranial nerve V branches?

Answer 6

Opthalmic - SOF - sensory

Maxillary - Foramen rotundum - Sensory

Mandibular - foramen ovale - sensory (touch of ant. 2/3 tongue) + chewing muscles

Question 7

Function and leaving point of cranial nerve VI?

Answer 7

Abducens nerve leaves via SOF

motor for lateral rectus of eye

Question 8

Function and leaving point of cranial nerve VII?

Answer 8

Motor function for facial expression, PSMP of submandibular, sulingual and lacrimal glands

Sensory function (taste) of the anterior 2/3 of the tongue + soft palate

Internal acoustic meatus

Facial nerve palsy results in a dry mouth and alterd taste not to mention loss of expression

Question 9

Function and leaving point of cranial nerve VIII?

Answer 9

Sensory = info of sound and balance from middle ear to the brain

Internal acoustic meatus

Question 10

Function and leaving point of cranial nerve IX?

Answer 10

Glossopharyngeal

sensory = posterior 1/3 tongue (taste and touch), tonsils, pharynx, middle ear

motor = stylopharyngeus, upper pharyngeal muscles and parotid gland

Leaves via Jugular foramen

Question 11

Function and leaving point of cranial nerve X?

Answer 11

Vagus nerve

PSMP

motor + sensory (including external ear)

Jugular foramen

Question 12

Function and leaving point of cranial nerve XI?

Answer 12

(spinal) Accessory

Motor = sternocleidomastoid and trapezius

Jugualar foramen

Question 13

Function and leaving point of cranial nerve XII?

Answer 13

Hypoglossal

Tongue muscles & strap muscles by ansa cervicalis

Hypoglossal canal

Question 14

Bell’s Palsy

Answer 14

Loss of expression on one side of the face due to inflammation of the facial nerve, can be from herpes or any other infection leading to inflammation. Can resolve itself if the acute inflammation goes away.

Question 15

Divisions of the Opthalmic nerve

Answer 15

1. Frontal nerve nerve
2. Nasociliary nerve
3. lacrimal nerve