muscles of the Eyes

Question 1

Answer 1

Superior Rectus

• O: common tendinous ring
• I: sclera just behind the cornea on superior aspect of eye
• A: elevation & adduction of eyeball
• N: oculomotor nerve (CN III)

Question 2

Answer 2

Inferior Rectus

• O: common tendinous ring
• I: sclera just behind the cornea on inferior aspect of the eye
• A: depression and adduction of eyeball
• N: oculomotor nerve (CN III)

Question 3

Answer 3

Medial Rectus

• O: common tendinous ring
• I: sclera just behind the cornea on the medial aspect of eye
• A: adduction of eyeball (medial deviation)
• N: ocolomotor nerve (CN III)

Question 4

Answer 4

Levator Palpebrae Superiors

• O: lesser wing of the sphenoid above & anterior optic canal
• I: tarsal plate, skin & fascia of upper eyelid
• A: elevation of upper eyelid
• N: oculormotor nerve (CN III)

Question 5

Answer 5

Inferior Oblique

• floor of orbit lateral to lacrimal groove
• I: sclera beneath the lateral rectus (on laterl - inferior aspect of eye)
• A: abduction, rotation upward & laterally; elevation of adducted eye
• N: oculomotor nerve

Question 6

Answer 6

Lateral Recuts

• O: common tendinous ring
• I: sclera just behind the cornea on the lateral aspect of the eye
• A: abduction of eye ball (lateral deviation)
• N: Abducens nerve (CN VI)

Question 7

Answer 7

Superior Oblique

• O: body of sphenoid bone above optic canal
• I: sclera beneath superior rectus (on superior aspect of eye)
• A: rotation downward & medially; depression of adducted eye
• I: Trochlear nerve (CN IV)