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Which of the following defines a motor unit?
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9. Muscle Tissue
Introduction to Muscles and Muscle Tissue
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Which muscle is responsible for raising the upper eyelid?
A
Orbicularis oculi
B
Zygomaticus major
C
Levator palpebrae superioris
D
Frontalis
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Identify the function of each muscle listed in the options to understand their roles in facial movement.
The Orbicularis oculi is a muscle that encircles the eye and is primarily responsible for closing the eyelids.
The Zygomaticus major is a muscle that extends from the cheekbone to the corners of the mouth and is involved in smiling by elevating the corners of the mouth.
The Frontalis muscle is part of the occipitofrontalis muscle group and is responsible for raising the eyebrows and wrinkling the forehead.
The Levator palpebrae superioris is a muscle located in the upper eyelid and is specifically responsible for elevating or raising the upper eyelid.
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