HORNERS MUSCLE Meaning and
Definition
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Horner's muscle, also known as the Horner's muscle of the eyelid or the palpebral muscle of Horner, is a small smooth muscle located within the upper eyelid. It is part of the muscular system of the human eye.
Horner's muscle functions to regulate the movement and position of the upper eyelid. When this muscle contracts, it causes the upper eyelid to lift, allowing the eye to open and close more effectively. It is responsible for various voluntary and involuntary movements of the eyelid, including blinking and winking.
Named after the Swiss anatomist Jakob Horner, who discovered and described this muscle in the 18th century, Horner's muscle contains smooth muscle fibers, which are involuntary and non-striated. It is innervated by the oculomotor nerve (cranial nerve III). The firing of the nerve impulses to the muscle triggers its contraction, leading to the desired movement of the upper eyelid.
The contraction and relaxation of Horner's muscle are essential for maintaining proper eye function and protecting the delicate structures of the eye. Dysfunction or damage to this muscle can result in eyelid drooping (ptosis) or difficulty in eyelid movement, leading to various issues with vision and eye health.
Overall, Horner's muscle is an integral part of the intricate muscular system of the eye, enabling coordinated movement of the upper eyelid to ensure proper eye functioning and protection.
Common Misspellings for HORNERS MUSCLE
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Similar spelling word for HORNERS MUSCLE
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