Extraocular muscles

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 & extorsion of the eye

Innervation: inferior ramus of the oculomotor n.

Blood supply: ophthalmic & infraorbital a.

Question 2

Inferior rectus (L. straight)

Answer 2

Attachments: from the common tendinous ring to the inferior aspect of the sclera

Function: depression, adduction & extorsion of the eye

Innervation: inferior ramus of the oculomotor n.

Blood supply: ophthalmic & infraorbital a.

Question 3

Lateral rectus

Answer 3

Attachments: from the common tendinous ring to the lateral aspect of the sclera

Function: abduction of the eye

Innervation: abducens n.

Blood supply: opthalmic & lacrimal a.

Question 4

Levator palpebrae superioris

Answer 4

Attachments: from the inferior aspect of the lesser wing of the sphenoid to the tarsus & skin of the upper lid

Function: elevation of the upper lid

Innervation: superior ramus of the oculomotor n.

Blood supply: opthalmic & supraorbital a.

Question 5

Medial rectus

Answer 5

Attachments: from the common tendinous ring to the medial aspect of the sclera

Function: adduction the eye

Innervation: inferior ramus of the oculomotor n.

Blood supply: opthalmic, anterior ethmoidal & posterior ethmoidal a.

Question 6

Superior oblique

Answer 6

Attachments: from the superomedial, posterior aspect of the orbit (body of the sphenoid) to the superolateral, posterior aspect of the sclera passing around the trochlea

Function: abduction, depression & intorsion of the eye

Innervation: trochlear n.

Blood supply: opthalmic, anterior ethmoidal & posterior ethmoidal a.

Question 7

Superior recuts

Answer 7

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.

Blood supply: opthalmic & supraorbital a.