Cranial nerves

Question 1

What is the first cranial nerve?

Answer 1

Olfactory

Question 2

Which nerve is the the olfactory?

Answer 2

1st

Question 3

Where does the olfactory pass throught he skull?

Answer 3

The cribriform plate

Question 4

Where does the olfactory nerve go?

Answer 4

Directly to cortex not through thalamus only smell does this

Question 5

How much of the smell goes to opposite side?

Answer 5

85% stays same side 15% crosses over

Question 6

What can affect the olfactory nerve?

Answer 6

olfactory groove meningioma, parkinson’s epilepsy trauma in car crashes

Question 7

Where does olfactory nerve pass?

Answer 7

To he entorhinal cortex in the medial temporal lobe

Question 8

What type of fibres does the olfactory nerve carry?

Answer 8

sensory only (special)

Question 9

What does the optic nerve carry?

Answer 9

sensory only (special)

Question 10

Which nerve is the 2nd cranial nerve?

Answer 10

Optic nerve

Question 11

Where does the optic nerve leave/enter the skll?

Answer 11

The optic canal

Question 12

What happens to the fibres of the optic nerve(general overview)?

Answer 12

Passes to chiasm and fibres cross over, pass to the lateral geniculate nucleus in thalamus thenthrough pariaetal or temporal lobes to the visual cortex

Question 13

Explain the pathway of nasal fibres of the optic nerve?

Answer 13

They show the temporal field they cross over to the other sied and go round contralateral radiation

Question 14

What happens to inerior fibres of eye?

Answer 14

They have superior visual field and theygo through the temoiral lobe

Question 15

What is the erdinger-westphal mucluse?

Answer 15

It is involved in pupilary reflex and occulomotor nerve recieves feedback from the optic nerve

Question 16

What is the 3rd creanial nerve?

Answer 16

The occulomotor nerve

Question 17

What is the oculomotor nerve?

Answer 17

the 3rd nerve

Question 18

What does a 3rd nerve palsy cause?

Answer 18

down and out from superior oblique and lateral rectus

Question 19

How can the optic nerve be tested?

Answer 19

Visual fields, pupil reflex(but relies on occulomotor) visual acuity, fundoscopy

Question 20

What is the shape of the optic disk?

Answer 20

A cup shape so in normal the light bit and moving can tell if it is normal or swollen

Question 21

What can affect the pupilary reflex?

Answer 21

Siphillis will accomodate but slow to react to light
horner’s syndrome damage to sympathetic so droopy eyelid and small pupil
Holmes-adi pupul difference in size

Question 22

How does optic nerve lesion affect the pupil?

Answer 22

Won’t react to light and will be dialated more than normal

Question 23

What type of signal doe occulomotor, trochlear and abducens?

Answer 23

all skeletal motor but oculomotor does parasympathetic

Question 24

What is the action of superior oblique?

Answer 24

It intorsion, and abduction and declination

Question 25

Whre does occulomotor exit the brainstem?

Answer 25

The pontine sulcus at the front

Question 26

Where does the trochelar nerve exit the brainstem?

Answer 26

at the back of the pons

Question 27

What passes through the superior orbital fissue?

Answer 27

The 3rd 4th and opthalmic division of trieminal

Question 28

Where is the sixth cranial nerve leave the brain?

Answer 28

Bulbopontine sulcus

Question 29

What is sign of 4th nerve palsy?

Answer 29

trochlear double vision looking down

Question 30

What does the parasympathetic component of 3rd nerve do?

Answer 30

the short ciluarry muscles to contrace the lens and sphincter muscels to constricp pupil

Question 31

What is involved in the trigeminal nerve?

Answer 31

Sensatin to the face 3 divisions opthalmic top of head sclera of eye and top of nose, maxilliary upper lip, and mandubilar division along jaw It does muscles of mastication. The tongue normal sensation to anterior 2/3s

Question 32

What fibres are involved in the trigeminal nerve?

Answer 32

Somatic sensation to anteror 2/3 of tongue and face also the muscles of mastication