PUPILLARY SPHINCTER Meaning and
Definition
-
The pupillary sphincter is a circular muscle found in the iris of the eye that is responsible for regulating the size of the pupil. Located within the front part of the eye, this smooth muscle is surrounded by radial muscle fibers. The pupillary sphincter consists of involuntary, or smooth, muscle tissue, which means it is not under conscious control.
The primary function of the pupillary sphincter is to control the diameter of the pupil, the round opening in the center of the iris. By constricting or relaxing the muscle fibers, the pupillary sphincter can adjust the size of the pupil, thereby regulating the amount of light that enters the eye.
In bright light conditions, the pupillary sphincter contracts, causing the pupil to constrict and become smaller. This reduces the amount of incoming light, protecting the sensitive structures of the eye from potential damage. Conversely, in low light conditions, the pupillary sphincter relaxes, allowing the pupil to dilate and expand. This enables more light to enter the eye, enhancing visual sensitivity.
Overall, the pupillary sphincter plays a crucial role in maintaining the appropriate amount of light that enters the eye, thus aiding in clear vision and protecting the delicate structures of the eye from intense light.
Common Misspellings for PUPILLARY SPHINCTER
- oupillary sphincter
- lupillary sphincter
- -upillary sphincter
- 0upillary sphincter
- pypillary sphincter
- phpillary sphincter
- pjpillary sphincter
- pipillary sphincter
- p8pillary sphincter
- p7pillary sphincter
- puoillary sphincter
- pulillary sphincter
- pu-illary sphincter
- pu0illary sphincter
- pupullary sphincter
- pupjllary sphincter
- pupkllary sphincter
- pupollary sphincter
- pup9llary sphincter
Etymology of PUPILLARY SPHINCTER
The term "pupillary sphincter" is a compound word derived from two main components: "pupillary" and "sphincter".
1. Pupillary:
The word "pupillary" relates to the "pupil", which refers to the round opening located in the center of the iris of the eye. The term "pupil" itself stems from the Latin word "pupilla", meaning "little girl". This is a diminutive form of "pupa", which translates to "doll" or "little girl". The name is attributed to the small, reflective image visible within the eye's pupil.
2. Sphincter:
The term "sphincter" comes from the Ancient Greek word "sphíngktēr", meaning "band", "binder", or "contractor".
Similar spelling word for PUPILLARY SPHINCTER
Infographic
Add the infographic to your website:
