Sphincter pupillae muscle
Sphincter Pupillae Muscle
The Sphincter pupillae muscle is a muscle in the human eye that controls the size of the pupil. It is a circular muscle that forms a ring around the pupil, and is responsible for constricting the pupil in response to bright light.
Structure[edit | edit source]
The sphincter pupillae muscle is located in the iris of the eye. It is a smooth muscle that forms a ring around the pupil. The muscle fibers are arranged in a circular pattern, allowing the muscle to constrict the pupil when it contracts.
Function[edit | edit source]
The primary function of the sphincter pupillae muscle is to control the size of the pupil. It does this by constricting the pupil in response to bright light, a process known as miosis. This helps to protect the retina from damage caused by excessive light exposure.
Clinical significance[edit | edit source]
Damage to the sphincter pupillae muscle can result in a condition known as mydriasis, which is characterized by an abnormally dilated pupil. This can occur as a result of injury, disease, or the use of certain drugs.
See also[edit | edit source]
References[edit | edit source]
External links[edit | edit source]
- Wikimedia Commons has media related to Sphincter pupillae muscle.
- Wikimedia Commons has media related to Human eye anatomy.
Search WikiMD
Ad.Tired of being Overweight? Try W8MD's physician weight loss program.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro / Zepbound) available.
Advertise on WikiMD
WikiMD's Wellness Encyclopedia |
Let Food Be Thy Medicine Medicine Thy Food - Hippocrates |
Translate this page: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
தமிழ்,
తెలుగు,
Urdu,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
বাংলা
European
español,
Deutsch,
français,
Greek,
português do Brasil,
polski,
română,
русский,
Nederlands,
norsk,
svenska,
suomi,
Italian
Middle Eastern & African
عربى,
Turkish,
Persian,
Hebrew,
Afrikaans,
isiZulu,
Kiswahili,
Other
Bulgarian,
Hungarian,
Czech,
Swedish,
മലയാളം,
मराठी,
ਪੰਜਾਬੀ,
ગુજરાતી,
Portuguese,
Ukrainian
WikiMD is not a substitute for professional medical advice. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates Wikipedia, licensed under CC BY SA or similar.
Contributors: Prab R. Tumpati, MD