Terminology-04

Terminology-04 - 10 Lens – A semi-rigid transparent...

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Terminology; Biol 112-546, 547 Nervous System 1. Central Nervous System – consists of the brain and the spinal cord. 2. Neurotransmitters – Special chemicals which transmit nerve impulses. 3. Synaptic Terminals – Specialized structures which relay signals to other neurons. 4. Synapse – The gap between the synaptic terminal of a neuron and dendrites of another neuron or the receptors of an effector muscle or gland. 5. Nerve – A bundle of individual neurons. 6. Sclera – Also known as the white of the eye , is an opaque, fibrous, protective outer layer. 7. Cornea – The transparent outer layer of the sclera that admits light into the eye. The outer epithelial layer of the cornea is called the Conjunctiva . 8. Iris – A pigmented, diaphragm-like structure that has an adjustable opening, the pupil through which light passes. 9. Tapetum Lucidum – The posterior pigment layer behind the retina that reflects light and causes “eye-shine” in animals.
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Unformatted text preview: 10. Lens – A semi-rigid transparent structure that focuses images onto the retina. 11. Aqueous Chamber – A fluid filled chamber which maintains the shape of the cornea and proper eye pressure. 12. Retina – Sensory layer at the back of the eye that contains photoreceptors and sensory neurons. 13. Optic Nerve – Nerve fibers which connect the retina to the brain. 14. Optic disk – The conversion of the optic nerve onto a point on the retina which has no rods or cones. This is called a blind spot because images falling here cannot be perceived. 15. Rod Photoreceptors – function in dim light and are insensitive to color. 16. Cone Photoreceptors – Function in bright light and are responsible for detecting color. 17. Fovea – A region in the center of the retina where cones are concentrated. 18. Astigmatism – caused by an unevenly curved cornea that results in blurred vision and loss of fine detail....
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This note was uploaded on 04/03/2012 for the course BIOL 112 taught by Professor Vaughn during the Fall '08 term at Texas A&M.

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