Week 2 - Oculomotor Nerve

Question 1

Which cranial nerve is the a oculomotor nerve

Answer 1

It is the third cranial nerve

Question 2

What is a another word for motor fibre is and what do these fibres do

Answer 2

efferent fibres take information out of the brain to commanding muscles

Question 3

Motor fibre is can be split into two different sections or types what are these

Answer 3

a motor fibre can either be a somatic fibre – voluntary control or

an autonomic fibre – in voluntary control

Question 4

What are the two types of autonomic/in voluntary control motor fibre is that you can get?

Answer 4

And a autonomic motor fibre can either be parasympathetic – conservation of effort or

sympathetic – fight or flight

Question 5

Where does the nucleus of the oculomotor nerve fibre start

Answer 5

The Nucleus of the oculomotor nerve fibre starts at the rear of the midbrain above the pons below the optic nerve

Question 6

Explain the 10 step pathway of the oculus motor nerve

Answer 6

1. the oculomotor nerve Nicholas start of the rear part of the midbrain
2. this nerve then passes the red and nucleus
3. some fibres stay ipsilateral where some D can see and supply contralateral structures
4. the oculomotor nerve then emerges at the front of the brain stem
5. the nerve then passes between both superior and posterior cerebral arteries
6. The oculomotor nerve also passes the communicating artery for a short amount of time
7. a malfunction in one of these blood vessels can cause issues in the oculomotor nerve
8. the oculomotor nerve then enters the cabin this sinus – a blue blob filled with venous blood
9. the nerve then split off into two branches: the superior branch and the inferior branch
10. both branches Into the eye via the orbit through the superior orbital Fissure and the annulus of zinn

Question 7

Which muscles does the superior division of the oculomotor nerve supply – is it contralaterally or ipsilaterally

Answer 7

The superior division supplies;

The superior rectus – contralateral

Levita Palpebrae – contralateral and ipsilateral

Question 8

Which muscles does the inferior division of the oculomotor nerve supply

State whether it is ipsilateral or contralateral

Answer 8

The inferior division of the oculomotor nerve supply is the inferior of leak, inferior rectus, medial rectus

This is all ipsilaterally