How Do You Spell MUSCULUS SPHINCTER PUPILLAE?

Pronunciation: [mˈʌskjʊləs sfˈɪŋktə pjˈuːpɪlˌiː] (IPA)

The phrase "Musculus Sphincter Pupillae" refers to the muscle responsible for controlling the size of the pupil. The spelling of the word "sphincter" can be tricky to pronounce correctly as it includes multiple consonants in a row. The IPA phonetic transcription for "sphincter" is /ˈsfɪŋktər/, with the "ph" being pronounced as an "f." Overall, the correct pronunciation of "Musculus Sphincter Pupillae" is muhs-kyoo-luhs sfingk-ter poo-puh-lay. It's important to use correct pronunciation when discussing medical terminology to ensure clear communication.

MUSCULUS SPHINCTER PUPILLAE Meaning and Definition

1. Musculus Sphincter Pupillae, also known as the pupillary sphincter muscle, is a small circular muscle found in the iris of the eye. It is responsible for regulating the size of the pupil, the central opening of the iris that controls the amount of light entering the eye.

   The musculus sphincter pupillae is composed of smooth muscle fibers, specifically termed as the intrinsic iris muscles. It forms a circular band around the edge of the pupil. When this muscle contracts, it constricts the pupil, making it smaller in diameter. This constriction occurs in response to the parasympathetic nervous system, which controls involuntary movements and responses in the body.

   The primary function of the pupillary sphincter muscle is to regulate the amount of light entering the eye. In bright light conditions, the muscle contracts, narrowing the pupil to prevent excessive light from entering and potentially damaging the sensitive structures in the retina. In contrast, in low light conditions, the muscle relaxes, dilating the pupil to allow more light to enter and improve visual acuity in darker environments.

   Disorders or dysfunctions of the musculus sphincter pupillae can result in abnormalities in pupillary size and reactivity, leading to conditions such as anisocoria (unequal pupil size), miosis (excessive constriction), or mydriasis (excessive dilation). These abnormalities may be indicative of underlying health issues or neurological disorders and may require medical attention.

2. A ring of muscular fibers surrounding the pupillary border of the iris.

   A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.

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