CN III-Oculomotor Nerve

Question 1

Characteristics of CN III- Oculomotor nerve

Answer 1

1. Fibers extend from the ventral midbrain, pass through the superior orbital fissure, and go to the extrinsic eye muscle.
2. Situated in the anterior part of gray matter that surround cerebral aqueduct of the midbrain.
3. Lies at the level of superior colliculus

Question 2

CN III Pathway

Answer 2

Question 3

Muscle innvervation by CN III

Answer 3

1. Eye movement
   Superior, inferior, medial rectus muscles and inferior oblique muscle
2. Opening of eyelid
   Levator palpebrae superioris
3. Constriction of pupil
   Circular muscle
4. Focusing of pupil
   Ciliary muscle

Question 4

Type of nerve

Answer 4

Motor

Question 5

Clinical Application

Answer 5

CN III Palsy
Damage causes drooping eyelid, dilated pupil, double vision, difficulty focusing and inability to move eye in certain directions

Question 6

2-minute CN III

Answer 6

2-Minute Neuroscience: Oculomotor Nerve (Cranial Nerve III)

Adapted from Neuroscientifically Challenged | YouTube Channel