Eye Anatomical Short Definitions -- Lesson 264

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EIn this post we would come through the definitions shortly.
1. Accommodation: - The adjustment of the eye made normally for looking at objects at different distances. To bring an object into focus on the retina, the lens is made thinner or fatter by the ciliary body.
2. Anterior chamber: -  This is the area behind the cornea and in front of the lens and iris.  Aqueous humor is contained in it.
3. Aqueous humor: - Fluid is produced by the ciliary body and found in the chambers which are anterior and posterior.
4. Choroid layer: - The vascular and middle layer of the eye between the retina and the sclera.
5. Ciliary body: - It is the structure which is on each side of the lens that connects the choroids and the iris. This also contains ciliary muscles, which control the shape of the lens, and secretes aqueous humor.
6. Cones: - The receptor cells which is called photosensitive receptor cells transform light energy into a nerve impulse. Cones are responsible for color and central vision.
7. Conjuctiva: - A delicate membrane lining the eyelids and covering the anterior eyeball.
8. Cornea: - Fibrous transparent layer of clear tissue that extends over the anterior portion of the eyeball.
9. Fovea centralis: - The tiny pit or depression in the retina that is the region of clearest vision.
10. Fundus of the eye: - The posterior and inner part of the eye.
11. Iris: - The colored portion of the eye.
12. Lens: - Behind the pupil of the eye, a transparent biconvex body is situated. It bends light rays to bring them into focus on the retina.
13. Macula: - A yellowish region on the retina, lateral to and slightly below the optic disk; and also contains the fovea centralis.
14. Optic chiasm: - The point at which the fibers of the optic nerve cross in the brain.
15. Optic disk: - The region at the bake of the eye where the optic nerve meets with retina. It is the blind spot of the eye because it contains nerve fibers only and there are no rods and cones and thus this is insensitive to light.
                   
In the next post we would learn some more definitions.

To go to the previous post from here, please click the link below.

http://learn-free-medical-transcription.blogspot.com/2011/09/eye-its-anatomy-and-physiology-iii.html

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