pupil definition anatomy
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Pupil The pupil is a hole located in the center of the iris of the eye that allows light to strike the retina.It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil.he pupil is a hole located in the center of the iris of the eye that allows light to strike the retina.
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- The pupil is the round opening in the middle of the iris or colored part of the eye. The pupil usually constricts or becomes smaller when exposed to light, and tends to dilate or become larger under low lighting or dark conditions. The human lens can be thought of as being similar in shape to a magnifying lens.
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How Does The Human Eye Work? What is the function of the pupil in the human eye? The pupil is an adjustable opening that controls the intensity of light permitted to strike the lens. The lens focuses light through the vitreous humor, a clear gel-like … substance that fills the back of the eye and supports the retina
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What does the pupil do in bright light? The pupil is a little hole in the centre of your eye and when bright light hits the eye the little ring round the eye that can be different colours on different peoples eyes closes over to let les light in.
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- [pyo̅o̅′pəl] Etymology: L, pupa, doll. a circular opening in the iris of the eye, located slightly to the nasal side of the center of the iris. Like the iris, the pupil lies posterior to the cornea and the anterior chamber of the eye and is anterior to the lens. Its diameter changes with contraction and relaxation of the muscular fibers of the iris as the eye responds to changes in light, emotional states, and autonomic stimulation.
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vision Top, Anatomy of the eye. Vision is the reception of images by the eye as a result of the passage of light into the eye. Light is focused by the lens on the retina, where it is converted into nerve impulses that are transmitted to the centers in the brain where images are interpreted. achromatic vision monochromatic vision.
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- In medicine, the pupillary reflex or pupillary light reflex is the reduction of pupil size in response to light. It is a normal response and dependent on the function of the optic nerves and oculomotor nerves. Pupillary constriction is sometimes used as a synonym for pupillaryreflex but something more general.he Nervous System has FOUR FUNCTIONS that enable the body to respond quickly. The Nervous System: A. Gathers information both from the outside world and from inside the body. SENSORY FUNCTION B. Transmits the information to the processing area of the brain and spinal cord.
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- pupil noun [C] (STUDENT). A2 a ​person, ​especially a ​child at ​school, who is being ​taught: a second-year pupil a primary-school pupil The ​school has over 400 pupils. There is a very ​relaxed ​atmosphere between ​staff and pupils at the ​school. Her ​school ​report ​described her as a very ​promising pupil.
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About the Eye and How It Works The Iris and the Pupil. The iris is a tissue inside the eye that has a hole in the center called the pupil. The iris contains muscles that allow the pupil to become larger (open up or dilate) and smaller (close up or constrict). The iris regulates the amount of light that enters your eye by adjusting the size of the pupil opening. In bright light, the iris closes (or constricts) and makes the pupil opening smaller to restrict the amount of light that enters your eye.
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Pupil Size and Your Health The pupil is the round black circle in the center of the iris, the colored part of your eye. The pupil is actually a hole through which light passes to the retina, the light-sensitive layer in the back part of the eye.
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Pupil The pupil is a hole located in the centre of the iris of the eye that allows light to strike the retina. It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil.
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Eye Anatomy The pupil is the round, dark, central opening of the eye through which light enters.
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Eye Anatomy: An Easy Guide To Your Eye The pupil acts as an entry point for light to enter your eye. Surrounding muscles in the iris, called the pupillae, adjust the pupil’s size automatically depending on light conditions. In light conditions, your pupil will probably be around 3mm in diameter. In total darkness, this diameter can extend to over 6mm.
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- Etymology: L, pupa, doll. a circular opening in the iris of the eye, located slightly to the nasal side of the center of the iris. Like the iris, the pupil lies posterior to the cornea and the anterior chamber of the eye and is anterior to the lens.Its diameter changes with contraction and relaxation of the muscular fibers of the iris as the eye responds to changes in light, emotional states, and autonomic stimulation.tymology: L, pupa, doll. a circular opening in the iris of the eye, located slightly to the nasal side of the center of the iris. Like the iris, the pupil lies posterior to the cornea and the anterior chamber of the eye and is anterior to the lens.
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pupil Pupil is defined as a dark circular opening in the center of the iris in the eye. An example of the pupil is the center part of the eye that gets smaller when you are exposed to very bright light in order to limit light exposure to the retina. The definition of a pupil is a student in school. A first grader attending elementary school is an example of a pupil.
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What does the pupil do in bright light? The pupil is a little hole in the centre of your eye and when bright light hits the eye the little ring round the eye that can be different colours on different peoples eyes c … loses over to let les light in.
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Pupil The pupil is a hole located in the center of the iris of the eye that allows light to strike the retina. It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil.
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Unequal Pupil Size in Dogs Unequal Pupil Size in Dogs. Save to mypetMD. The pupil is the circular opening in the center of the eye that allows light to pass through. The pupil expands when there is little light present, and contracts when there is a greater amount of light present. Anisocoria refers to an unequal pupil size.
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- Noun. 1. pupillary reflex-reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller. light reflex, miosis, myosis.
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pupil Definition of pupil. 1 : a child or young person in school or in the charge of a tutor or instructor : student. 2 : one who has been taught or influenced by a famous or distinguished person.
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Unequal Pupil Size in Dogs Anisocoria in Dogs. The pupil is the circular opening in the center of the eye that allows light to pass through. The pupil expands when there is little light present, and contracts when there is a greater amount of light present. Anisocoria refers to an unequal pupil size. This condition causes one of the dog's pupils to be smaller than the other.
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Chapter 46: The eye The sphincter pupillae is situated in the posterior part of the iris, near the pupil, and consists of smooth muscle. The sphincter pupillae is supplied by parasympathetic fibers by way of the short ciliary nerves, and its contraction results in constriction of the pupil (miosis) (fig. 46-7).
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Germany Pupil is the opening in the central part of iris which is responsible for controlling light entering into eyes. So pupil dilates when the light is dim while it shrinks if the light is strong and bright. So in a dim environment, dilated pupils are very common and normal that you don't have to worry about it.