Extraocular Muscles (actions, innerv)

Question 1

Inferior oblique

Answer 1

attachments- from the maxilla lateral to the nasolacrimal groove to the inferolateral, posterior aspect of the sclera

function- elevation, abduction and extorsion of the eye

innervation- inferior ramus of the oculomotor n.

Question 2

Inferior rectus

Answer 2

(L. straight)

attachments- from the common tendinous ring to the inferior aspect of the sclera

function- depression, adduction & extorsion of eye

innervation- inferior ramus of the oculomotor n.

Question 3

Levator palpebrae superioris

Answer 3

attachments- from the inferior aspect of the lesser wing of the sphenoid to the tarsus and skin of the upper lid

function- elevation of the upper lid

innervation- superior ramus of the oculomotor n.

Question 4

Medial rectus

Answer 4

attachments- from the common tendinous ring to the medial aspect of the sclera

function- adduction of the eye

innervation- inferior ramus of the oculomotor n.

Question 5

Superior rectus

Answer 5

attachments- from the common tendinous ring to the superior aspect of the sclera

function- elevation, adduction & intorsion of the eye

innervation- superior ramus of the oculomotor n.

Question 6

Lateral rectus

Answer 6

attachments- from the common tendinous ring to the lateral aspect of the sclera

function- abduction of the eye

innervation- abducens n.

Question 7

Superior oblique

Answer 7

attachments- from the superomedial, posterior aspect of the orbit to the superolateral, posterior aspect of the sclera passing around the trochlea (superomedial, anterior aspect of the orbit)

function- depression, abduction, & intorsion of the eye

innervation- trochlear n.