Extrinsic Eye Muscles (MT)

Question 1

What extrinsic eye muscles are innervated by the upper division of CN III?

Answer 1

1. Levator Palpebrae

2. Superior Rectus

Question 2

What extrinsic eye muscles are innervated by the lower division of CN III?

Answer 2

1. Inferior Rectus
2. Medial Rectus
3. Inferior Oblique

Question 3

What extrinsic eye muscle isinnervated by CN VI?

Answer 3

Lateral Rectus

Question 4

What extrinsic eye muscle is innervated by CN IV?

Answer 4

Superior Oblique

Question 5

Levator Palpebrae Superioris Origin and insertion

Answer 5

Origin:
- Lesser Wing of Sphenoid

Insertion:

• Superior Tarsal Plate
• Skin of Eyelid

Question 6

Superior Rectus Origin and insertion

Answer 6

Origin:
- Common Tendinous Ring

Insertion:
- SUPERIORLY on the anterior hemisphere of the eyeball

Question 7

Inferior Rectus Origin and insertion

Answer 7

Origin:
- Common Tendinous Ring

Insertion:
- INFERIORLY on the anterior hemisphere of the eyeball

Question 8

Medial Rectus Origin and Insertion

Answer 8

Origin:
- Common Tendinous Ring

Insertion:
- MEDIALLY on the anterior hemisphere of the eyeball

Question 9

Lateral Rectus Origin and Insertion

Answer 9

Origin:
- Common Tendinous Ring

Insertion:
- Laterally on the anterior hemisphere of the eyeball

Question 10

Superior Oblique Origin and Insertion

Answer 10

Origin:
Body of Sphenoid

Insertion:
Lateral Posterior Quadrant of the Eyeball

Question 11

Inferior Oblique Origin and Insertion

Answer 11

Origin:
Medial Floor of Orbit Posterior to rim

Insertion:
Lateral Posterior Quadrant of Eyeball

Question 12

Levator Palpebrae Innervation and Action

Answer 12

Innervation:
- CN III, Upper Division

Action:
- Elevate Upper Eyelid

Question 13

Superior Rectus Innervation and Action

Answer 13

Innervation:
- CN III, Upper Division

Action:
- Elevation, Adduction, Intorsion of eyeball

Question 14

Inferior Rectus Innervation and Action

Answer 14

Innervation:
- CN III, Lower Division

Action:
- Depression, Adduction, Extorsion of eyeball

Question 15

Medial Rectus Innervation and Action

Answer 15

Innervation:
- CN III, Lower Division

Action:
- Adduction of Eyeball

Question 16

Lateral Rectus Innervation and Action

Answer 16

Innervation:
- CN VI

Action:
- ABduction of eyeball

Question 17

Superior Oblique innervation and Action

Answer 17

Innervation:
- CN IV

Action:
- Depression, abduction, intorsion of eyeball

Question 18

Inferior Oblique Innervation and Action

Answer 18

Innervation:
- CN III, lower division

Action:
- Elevation, abduction, extorsion of eyeball

Question 19

What muscles are at work in intorsion of the eyeball?

Answer 19

1. SUPERIOR Rectus

2. SUPERIOR Oblique

Question 20

What muscles are at work in extorsion of the eyeball?

Answer 20

1. INFERIOR Rectus

2. INFERIOR Obique

Question 21

What muscles are at work in ABduction of the eyeball?

Answer 21

1. superior OBLIQUE
2. inferior OBLIQUE
3. LATERAL Rectus

Question 22

What muscles are at work in ADuction of the

Answer 22

1. medial RECTUS
2. Lateral RECTUS
3. inferior RECTUS

Question 23

What muscles originate from the common tendinous ring?

Answer 23

Superior, Inferior, Medial, and Lateral rectus (aka ALL of the rectus muscles)

Question 24

What muscles insert on the anterior hemisphere of the eye?

Answer 24

ALL of the rectus mm.

Question 25

What muscles Insert on the lateral posterior Quadrant of the Eyeball?

Answer 25

Superior and Inferior Oblique mm.

Question 26

What muscles elevate the eyeball?

Answer 26

Superior Rectus

Inferior Oblique

Question 27

What muscles depress the eyeball?

Answer 27

Inferior Rectus

Superior Oblique