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13 Cards in this Set
- Front
- Back
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Five Special Senses
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Vision
Hearing Smell Taste Equilibrium |
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Special vs General Senses
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General: Touch
Special senses located in head 12 pairs of cranial nerves deal w/ special senses |
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Occipital Lobe
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Responsible for vision
AP (action potential) sent to back too. |
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Anatomy of the Eye
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Protection: eyebrow, eyelid, eyelashes
Blinking: lubrication Tears: microbrial enzymes in fluid, antibiotics (lacrimal glands) Squinting Conjunction: pink eye develops in the area |
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Nerves that control Eye Movement
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Skeletal Muscle tissue
- 4 rectus (straight) muscles - 2 oblique muscles - 3 cranial nerves: - occulomotor nerve (CN3) = most important - abducens nerve (CN6) = lateral abducens - trochlear nerve (CN4) = controls superior |
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Optic Nerve (CN2)
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Responsible for vision
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Three layers that make up the Eye
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Sclera: durable, tough layer tissue, continuation of the dura layer
- Cornea: continuation of anterior, light passes through eye & bends light Choroid: brown pigment layer, lot of milan - prevents scattering of light, structures get blood supply through here |
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Choroid Structures
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Ciliary Body: smooth muscle
- change shape of lens - produce aqueous humor Iris: smooth muscle - colored part of eye, contain only brown pigment - amount of pigment causes change in color - controls amount of light entering the eye |
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Iris flight or fight
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Sympathetic state: dilates - wide more light
Parasympathetic state: constricts - less light |
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Retina
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Two Layers
- outer pigmented layer: prevents light scatter - inner neural layer: contains photoreceptors |
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Fovea Centralis
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Area of the retina where vision is sharpest
Acute vision All CONES Color area is sharpest |
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Optic Disc
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Blind spot - no photoreceptors
Where CN2 (optic nerve) exits the eye |
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Rods vs Cones
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Both photoreceptors
- specialized cell that convert light energy into an AP Rods: very sensitive, respond to light intensity, produce gray tones Cones: not very sensitive, respond to a specific light intensity (red, green, blue), produce color |
