Lecture7 - Special Senses I

Lecture7 - Special Senses I - – Cones sense color but...

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Special Senses Vision Eye gathers visual information and sends to the brain to be processed/understood Outer layer Sclera : tough white connective tissue. Maintain the shape of the eye and provide attachment for the muscles that move the eye Cornea : crystal clear portion of the surface of the eye that lets light enter, well supplied with nerve endings Middle layer Choroid : Vascular layer situated between the retina and sclera, location of major blood vessels inside the eye Ciliary Body : Ring of tissue that encircles the lense. Contain smooth muscle fibers called ciliary muscles that help control the shape of the lense Iris : Colored portion of the eye, regulates entrance of light into the eye by contracting and dilating Inner layer Retina : light sensitive layer that covers 65% of the interior surface of the eye. Photoreceptors are arranged in a layer. Receives and transmits focused images. Two types of photoreceptors Rods: sense brightness, extremely sensitive, but don’t distinguish colors
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Unformatted text preview: – Cones: sense color but less sensitive. Three types (RGB) Hearing Sound waves make the eardrum vibrate, then the small bones in the ear vibrate and the vibrations go through the snail like chochlea which turns them into nerve impulses to the brain. – Outer Ear ○ Pinna : visible part of the ear. Collects and focuses sound waves ○ Ear Canal : tube that waves move from pinna to middle ear. ○ Eardrum : thin membrane that separate outer ear from middle ear, transmits sound to ossicles inside middle ear – Middle Ear ○ Three bones ( ossicles ): bones that form the linkage between eardrum and cochlea ○ Two muscle tendons ○ Two nerve bundles – Inner Ear ○ Cochlea : snail shaped, hollow, conical chamber of bone Hair cells : specialized mechanoreceptors convert the mechanical stimuli into neural information ○ Vestibular Apparatus : determines movement and orientation in space Semicircular canals : sense rotational movements...
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This note was uploaded on 04/06/2008 for the course BMVS 4064 taught by Professor Dr.lee during the Spring '08 term at Virginia Tech.

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