Instant anatomy tutorial

Question 1

What does CN III lie in close proximity to and what is it vulnerable to here ?

Answer 1

Lies in close proximity to the posterior communicating artery and is vulnerable to aneurysms here

Question 2

What is unique about the 4th CN ?

Answer 2

Arises from the dorsal aspect of the brainstem (specifically the pons) and then crosses over where it runs upwards and over the petrous temporal bone

Question 3

Where does CN V arise and ?

Answer 3

Arises from 3 nuclei in the midbrain and medulla

Question 4

Where does the 6th CN arise ?

Answer 4

The pons in the brainstem

Question 5

What does the rectus muscles arise from ?

Answer 5

The common tendinous ring

Question 6

Where is the conjunctiva located ?

Answer 6

• The inner surface of the eyelids is covered by the palpebral conjunctiva.
• The eyeball is lined by the bulbar conjunctiva.