Dilator pupillae muscle

Dilator Pupillae Muscle

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Illustration of the Dilator Pupillae Muscle

The Dilator Pupillae Muscle is a smooth muscle in the eye that opens the pupil in response to low light. It is innervated by the sympathetic nervous system and is located in the iris of the eye.

Structure

The Dilator Pupillae Muscle is a thin layer of radial muscle that extends from the outer edge of the iris towards the pupil. It is located immediately beneath the stroma of the iris.

Function

The primary function of the Dilator Pupillae Muscle is to dilate the pupil. This is achieved by the contraction of the muscle, which pulls the iris outward, increasing the size of the pupil and allowing more light to enter the eye. This process is known as mydriasis.

Clinical significance

Abnormal function of the Dilator Pupillae Muscle can result in a number of conditions, including anisocoria, mydriasis, and Horner's syndrome.

See also

• Sphincter pupillae muscle
• Pupil
• Iris (eye)

External links

• Anatomy.org