III occulomotor

Question 1

Where does Oculomotor nerve originate?

Answer 1

Oculomotor nucleus (motor)
Edinger-westphal nucleus (parasympathetic)

Question 2

Functions of Oculomotor nucleus

Answer 2

Motor:
Extraocular muscles (superior, medial, inferior rectus, inferior oblique, Levator palpebrae superioris)

Question 3

Functions of edinger-Westphal nucleus

Answer 3

Parasympathetic:
- Pupillary constriction in response to light & accommodation for near vision (sphincter pupillae muscle)
- thickening of lens during accommodation (ciliaris muscle)

Question 4

Oculomotor parasympathetic fibers synapse with the ____

Answer 4

Ciliary ganglion

Question 5

Oculomotor Postganglionic parasympathetic fibers travel via ____ to the ____

Answer 5

Short ciliary nerves
Sphincter pupillae and ciliaris muscles

Question 6

Postganglionic sympathetic fibers from the internal carotid plexus (from cervical sympathetic ganglia) travel via ____ nerves to the ____

Answer 6

Short Ciliary
Dilator pupillae

Question 7

How are Oculomotor nerves examined?

Answer 7

Light & accommodation reflexes
Vertical & medial eye movements
Eyelid movement

Question 8

Lesion of Oculomotor nucleus

Answer 8

Diplopia
Ptosis
Lateral strabismus

Question 9

Lesion of edinger-westphal nucleus

Answer 9

Mydriasis
Cycloplegia

Question 10

Lesion of dilator pupillae

Answer 10

Myosis (Pinpoint pupil)

Question 11

Oculomotor nerve exits the skull via the ____

Answer 11

Superior orbital fissure