Special Senses Web - The sense of touch is a mix of general...

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The sense of touch is a mix of general senses Figure 7.7 Pain Soft touch Deep pressure Propioceptors – stretch detection and Temperature…
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5 special senses = localized groups of sensors or require complex organs Smell Taste Sight Hearing Equilibrium
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The Eye and Vision 70% of all sensory receptors are in the eyes!! > 1,000,000 per eye! Eyes protected by layer of fat inside bony orbit
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Eyes come with accessory structures for protection and proper function Eyelids and eyelashes Conjunctiva Lacrimal apparatus Extrinsic eye muscles
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Eyelids and eyelashes protect exposed eye structures Tarsal glands = modified sebaceous glands behind lashes that lubricate eye
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Conjunctiva = mucus membrane that lines eyelids and part of outer-eye surface Secretes mucus to lubricate the eye Conjunctivitis = inflammation of the conjunctiva (pinkeye = infectious form)
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Lacrimal apparatus cleans, lubes, and disinfects eye surface Lacrimal gland— produces lacrimal fluid of dilute salts, antibodies, and an antibiotic (lysozyme) Lacrimal canals —drain lacrimal fluid from eyes Lacrimal sac —provides passage to nasal cavity Nasolacrimal duct empties fluid into nasal cavity Emotional upset or eye irritation increases secretion of lacrimal fluid = tears and sniffles
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Extrinsic eye muscles – attach to outer eye surface and produce eye movements 6 different muscles!
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Accessory Structures of the Eye Figure 8.3c
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Eye Anatomy: The Fibrous Layer – outermost layer Sclera – ‘white of the eye’, connective tissue Cornea – transparent ‘window’, allows light inside eye through pupil Repairs itself easily Only human tissue transplanted without fear of rejection
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Eye Anatomy: Vascular Layer – middle layer Choroid - blood-rich nutritive layer, posterior of the eye Pigment here prevents light scattering Ciliary body — smooth muscle attached to lens Iris —regulates light entering eye Gives eye color Pupil —opening in the iris
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This note was uploaded on 01/13/2012 for the course ANATOMY 10 taught by Professor Prestongalusky during the Fall '11 term at Riverside Community College.

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Special Senses Web - The sense of touch is a mix of general...

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