Question

multiple choice question

which muscle attaches to the lacrimal bone as well as to both the upper and lower eyelids?

levator palpebrae superioris
nasalis
orbicularis oculi
corrugator supercilii

Explanation:

Identify the anatomical target

Using the Facial Expression Muscles knowledge point
The question asks for a muscle that attaches to the lacrimal bone and to both the upper and lower eyelids (palpebrae).

Evaluate the muscle options

• Levator palpebrae superioris: Originates on the lesser wing of the sphenoid bone and inserts into the upper eyelid only. Its primary action is to elevate the upper eyelid.
• Nasalis: Located on the nose; it compresses and dilates the nostrils. It does not attach to the eyelids.
• Orbicularis oculi: A sphincter muscle surrounding the eye. Its lacrimal part (pars lacrimalis) originates from the posterior lacrimal crest of the lacrimal bone and inserts into the medial aspects of both the upper and lower eyelids.
• Corrugator supercilii: Located deep to the eyebrow; it draws the eyebrows medially and inferiorly.

Confirm the correct muscle

The orbicularis oculi is the only muscle listed that has direct attachments to the lacrimal bone and spans across both the upper and lower eyelids to close the eye.

Answer:

• Levator palpebrae superioris
• Nasalis
• Orbicularis oculi (Correct answer)
• Corrugator supercilii