OCular Anatomy (Levator Palpebrae Superioris Quiz)

What is the origin of the levator palpebrae superioris?

Answer explanation

The levator palpebrae superioris originates from the lesser wing of the sphenoid bone, just above the optic foramen. It is responsible for elevating the upper eyelid.

What is the action of the levator palpebrae superioris?

Answer explanation

The levator palpebrae superioris is responsible for elevating the upper eyelid, allowing for the opening of the eye. This action is crucial for vision and protecting the eye.

Which nerve innervates the levator palpebrae superioris?

Answer explanation

The levator palpebrae superioris is innervated by the oculomotor nerve (CN III). This nerve controls the elevation of the upper eyelid, making it essential for proper eyelid function.

What is the blood supply for the levator palpebrae superioris?

Answer explanation

The blood supply for the levator palpebrae superioris is primarily from the superior ophthalmic vein and the branches of the ophthalmic artery, particularly the levator palpebrae superioris branch.

What are the main actions of the levator palpebrae superioris?

Answer explanation

The levator palpebrae superioris primarily elevates the upper eyelid, allowing for eye opening. It also plays a role in maintaining eyelid position during gaze.

What anatomical features limit the actions of the levator palpebrae superioris?

Ans.

A.Lateral and medial attachments of the muscle's aponeurosis which prevent further elevation of the eyelid once they are stretched maximally

B. Orbital septum, which is a fibrous part of the eyelid that when compressed maximally , prevents further retraction of the eyelid

C. Antagonist actions of the orbicularis oculi muscle, that counteracts the levator palpebrae superioris since it pulls the eyelid in the opposite direction

Answer explanation

The levator palpebrae superioris is limited by the surrounding bony structures of the orbit and the presence of the superior rectus muscle, which can restrict its movement and function in elevating the upper eyelid.

7. 7. As the LPS runs from the apex of the orbit to the eyelid, how does it looks like

8. A. narrow and it widens

9. B. wide the narrows

8. 8. What muscle is found below the LPS

9. Ans. superior rectus

9. 9. The fascial sheats of the Levator palpebrae superioris and superior rectus is fused together via what

10. Ans. check ligament

10. 10. Base on the PPT what is the most superior structure found in the orbit

11. Ans. LPS