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Chp 9 - Senses

These often exist as indiv. cells or receptor units and are widley distributed throughout the body. general sense organs
These are large and complex organs, localized grouping of specialized receptors. special sense organs
Two other classifications for sense organs encapsulated/unencapsulated and byt the type of stimuli required to activate receptors
What sense does photoreceptors sense? light
What sense does chemoreceptors sense? chemicals
What sense does pain receptors sense? injury
What sense does thermoreceptors sense? temperature change
What sense does mechanoreceptors sense? movement or deforming of capsule
What sense does proprioceptors sense? position of body parts or changes in muscle length or tension
What are these examples of: free nerve endings, meissner's corpuscles, ruffini's corpuscles, pacinian corpuscles. general sense organs
What are the three layers of the eyeball? sclera,choroid, retina
-tough outer coat, "white" of eye, cornea is transparent part over the iris sclera
-pigmented vascular layer prevents scattering of light; front part made of ciliart muscle and iris, colored part of the eye choroid
innermost layer of the eye;contains rods and cones retina
-mucous membrane covering the front surface of the sclera and also lines the eyelid; kept moist by tears found in the lacrimal gland conjunctiva
-transparent body behind the pupil; focuses light rays on the retina lens
WHat is the pathway of light? lightwaves-cornea-pupil-lens-retina-rods & cones-optic nerve-occipital lobe of cerebral cortex
What are the two types of eye fluids? Aqueous humor and vitreous humor
-anterior chamber in front of the lens; water like substance aqueous humor
-in the posterior chamber behind the lens; jelly like vitreous humor
Which layer of the eyeball contains the rod and cones? The innermost, retina
What is the point of exit for the optic nerve known as? the blind spot
Where does visual interpretation occur? in the visual cortex of the cerebrum
What are the functions of the ear? hearing, equilibrium and balance
-more about touch general sense organs
taste, smell, vision special sense organ
General sense organs can be broken down into two groups, what are they? free and encapusalted
What are the three divisions of the ear? external, middle, inner
What part of the ear contains: auricle(pinna), external auditory canal, ends with tympanic membrane? external
What is the tympanic membrane? ear drum
Which part of the ear contains: ossicles, ends at oval window? middle ear
What are the bones that make up the ossicles? malleus, incus, stapes
What is a otitis media? middle ear infection
What connects the middle ear to the throat? eustachian tube
Which part of the ear houses: bony labyrinth, semicircular canals, cochlea? inner ear
Where is perilymph found? bony labyrinth
Where is endolymph found? membranous labyrinth
Where are the cristae ampullaris found? What do they do? semicircular canals; balance
What is the pathway of sound? sound strikes eardrum, vibrates-ossicles vibrate-oval window vibrates-perliymph vibrates-endolymph vibrates-hair cells bend generating nerve impluse
Another word for gustatory cell? taste buds
What are the 4 primary taste sensations? sweet, sour, bitter, salty
Where are chemoreceptors located that are responsible for smell? epithelial tissue in the upper part of the nasal cavity
Created by: erikasmith28