Lecture 8- Cranial nerves introduction

Question 1

how many cranial nerves

Answer 1

12

Question 2

acronyms for learning 12 cranial nerves

Answer 2

On, On, On, They Travelled And Found Voldemort Guarding Very Ancient Horcruxes

Question 3

On (1)

Answer 3

CN I- Olfactory

Question 4

On (2)

Answer 4

CN II- Optic

Question 5

On (3)

Answer 5

CN III- Oculomotor

Question 6

They (4)

Answer 6

CN IV- Trochlear

Question 7

Travelled (5)

Answer 7

CN V- Trigeminal nerve

Question 8

And (6)

Answer 8

CN VI- Abducens

Question 9

Found (7)

Answer 9

CN VII- Facial

Question 10

Voldemort (8)

Answer 10

CN VIII- Vestibulocochlear

Question 11

Guarding (9)

Answer 11

CN IX- Glossopharyngeal

Question 12

Very (10)

Answer 12

CN X- Vagus

Question 13

Ancient (11)

Answer 13

CN XI-Accessory

Question 14

Horcruxes (12)

Answer 14

CN XII- Hypoglossal

Question 15

Cranial nerves III – XII arise from the brain stem (Figure 1). They can arise from a specific part of the brain stem (midbrain, pons or medulla), or from a junction between two parts:

Answer 15

• midbrain
• midbrain -pontine junction
• pons
• pontine-medulla junction
• medulla oblongata

Question 16

which cranial nerve emerge from the midbrain

Answer 16

trochlear IV (posterior) (longester intracranial length)

Question 17

which cranial nerve emerge from the midbrain-pontine junction

Answer 17

oculomotor III

Question 18

which cranial nerve emerge from the pons

Answer 18

trigeminal (V)

Question 19

which cranial nerve emerge from the Pontine- medulla junction

Answer 19

abducens facial vestibulocochlear (VI-VIII)

Question 20

which cranial nerve emerge from the medulla oblongata

Answer 20

posterior to the olive: glossopharyngeal, vagus, accessory (IX-XI). Anterior to the olive: hypoglossal (XII).

Question 21

Tip: Cranial nerves with the number 2 in them (e.g. 2-optic and 12-hypoglossal) exit through a

Answer 21

canal of the same name. They are the only cranial nerves to pass through canals.

Question 22

The cranial nerves are numbered by their

Answer 22

location on the brain stem (superior to inferior, then medial to lateral) and the order of their exit from the cranium (anterior to posterior) (Figures 1 & 2).

Question 23

which cranial nerve passes throguh the cribiform plate

Answer 23

Olfactory (CN I)- starts at the cortex

Question 24

which cranial nerve passes throguh the optic canal

Answer 24

optic nerve- thalamus

Question 25

superior orbital fissure

Answer 25

• Oculomotor (III)
• Trochlear (IV)
• Trigimenal Opthalmic branch (Va)
• Abducens (VI)

Question 27

foramen rotundum

Answer 27

maxillary branch of the trigmeninal nerve (Vb)

Question 28

foramen ovale

Answer 28

mandibular branch of trigeminal nerve (Vc)

Question 29

internal acoustic meatus

Answer 29

facial nerve (VII)

Vestibulocochlear (VIII)

Question 30

jugular foramen

Answer 30

glosopharyngeal n (IX)

Vagus n (X)

Accessory n(XI)

Question 31

hypoglossal canal

Answer 31

hypoglossal n (XII)

Question 32

each cranial nerve can be described as being

Answer 32

sensory, motor or both.

Question 33

they can more specifically transmit seven types of information; three are unique to cranial nerves

Answer 33

(SSS, SVS and SVM)

Question 34

GSS

Answer 34

general somatic snesory

general sensation from skin

Question 36

GVS

Answer 36

general visceral sensory

general sensation from viscera

Question 37

SSS

Answer 37

special somatic sensory

senses derive dfrom the ectoderm (e.g. sight, sound balance)

Question 39

SVS

Answer 39

Special visceral sensory

senses derived from endoderm (e.g. taste, smell).

Question 40

GSM

Answer 40

general somatic motor

skeletal muscle

Question 41

GVM

Answer 41

general visceral motor

smooth muscles of gut and automatic motor

Question 42

SVM

Answer 42

special visceral motor

muscles derived from pharyngeal arches