EXTRA OCULAR MUSCLES

Question 1

Located in the ventral part of the periaqueductal gray of the midbrain at the level of superior colliculus

PTOSIS (sagging of the upper eyelid)

MYDRIASIS (dilated pupil)

Answer 1

OCULOMOTOR MUSCLES AND NERVE

Question 2

Located at the ventral border of the periaqueductal gray of the midbrain at the level of inferior colliculus

Slight extorsiom or outward rotation of the superior part of the eye

Compensated by tilting of the head

Answer 2

TROCHLEAR NUCLEUS AND NERVE

Question 3

Located beneath the facial colliculus in the floor of the 4th ventricle in the caudal pons

MEDIAL DEVIATION or ESTROPIA and PARALYSIS OF ABDUCTION OF THE IPSILATERAL EYE

Answer 3

ABDUCENT NUCLEUS AND NERVE

Question 4

Extra-ocular muscles

Answer 4

Superior rectus
Inferior rectus
Medial rectus
Lareral rectus
Superior oblique
Inferior oblique

Supplied by CN III except SUPERIOR OBLIQUE by CN IV and LATERAL RECTUS by CN VI