Unit 4 - Head and Neck: Extraocular Muscles (Ex. III)

Question 1

S rectus

Answer 1

O: common tendinous ring of common annular tendon
I: sclera of eye
Inn: oculomotor n. (CN III), S branch
A: vertical axis - elevates eye; horizontal axis - adducts eye; AP axis - M rotation of eye

Question 2

I rectus

Answer 2

O: common tendinous ring of common annular tendon
I: sclera of eye
Inn: oculomotor n. (CN III), I branch
A: vertical axis - depresses eye; horizontal axis - adducts eye; AP axis - L rotates eye

Question 3

L rectus

Answer 3

O: common tendinous ring of common annular tendon
I: sclera of eye
Inn: abducens n. (CN VI)
A: horizontal axis - abducts eye

Question 4

M rectus

Answer 4

O: common tendinous ring of common annular tendon
I: sclera of eye
Inn: oculomotor n. (CN III), I branch
A: horizontal axis - adducts eye

Question 5

S oblique

Answer 5

O: sphenoid bone
I: sclera of eye
Inn: trochlear n. (CN IV)
A: vertical axis - depresses eye; horizontal axis - abducts eye; AP axis - M rotates eye

Question 6

I oblique

Answer 6

O: M orbital margin
I: sclera of eye
Inn: oculomotor n. (CN III), I branch
A: vertical axis - elevates eye; horizontal axis - abducts eye; AP axis - L rotates eye