LEVATOR PALPEBRAE SUPERIORIS MUSCLE Meaning and
Definition
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The levator palpebrae superioris muscle is a skeletal muscle that is responsible for the elevation or raising of the upper eyelid. It is located within the upper eyelid and attaches to the tarsal plate, a thick fibrous band of tissue that provides support to the eyelid.
The levator palpebrae superioris muscle originates from the lesser wing of the sphenoid bone, which is situated at the back of the orbit. From this origin, it extends forward and forms a tendon that inserts into the skin of the upper eyelid.
When the levator palpebrae superioris muscle contracts, it lifts the upper eyelid, exposing the cornea and allowing for vision. This muscle plays a crucial role in controlling eye movements and maintaining proper visual function by keeping the upper eyelid in a lifted position during waking hours.
The functioning of this muscle is controlled by the oculomotor nerve, which innervates it. The oculomotor nerve is a cranial nerve that arises from the brainstem and carries motor fibers to various eye muscles, including the levator palpebrae superioris muscle.
In summary, the levator palpebrae superioris muscle is a skeletal muscle involved in the elevation of the upper eyelid. It originates from the sphenoid bone and inserts into the upper eyelid skin. Its contraction allows for adequate vision and eye movements.
