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Anatomy Unit 13

QuestionAnswer
Sensory Receptors - recieve info from internal/external environments for each sense - each receptor is particularly sensitive to a distinct kind of environmental change - can be ends of neuron (dendrite) or other types of cells - stimulation generates action potential
Types of sensory receptor sight - light hearing - sounds Taste - food chemicals touch - pain, pressure, etc Smell - chemicals from odors
Sight - light photoreceptors
External anatomy of the eye - sclera - extraocular muscles - optic nerve (cranial nerve II) - cornea - Iris - Pupil
Sclera - the "white" of the eye, tough wall of the eyeball
Optic nerve (Cranial nerve II) - Carry axons from retina, from the back of the eye, to the base of the brain - how images get to the brain
Extraocular muscles 3 pairs of muscles that move eye inside eye socket
Cornea - glassy transparent external surface that covers the pupil and iris - helps focus entering light rays
Iris - surrounds pupil - gives eyes its color
Pupil hole or opening in eye that allows light to enter and reach the retina
Anatomy of the eye - vitreous humor - aqueous humor - lens - retina - optic disc - fovea (mascula)
Humor = fluid in the eye
Vitreous humor - watery fluid in between the lens and retina - it's pressure serves to keep the eyeball spherical
Aqueous Humor - watery fluid that lies between cornea and lens - provides nutrients and maintains the shape of the front of the eye
Lens - located behind iris - focuses light entering eye
Retina - located in the back of the eye - contains photoreceptor cells - converts light energy into nerve impulses to go to brain
Optic disc - where the optic nerve attaches - where blood vessels originate from - cannot see here - there are no photoreceptors AND blood vessels block other photoreceptors
Fovea (macula) - small indention in macula - produces sharpest vision
Created by: Shannonnev0822
 

 



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