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Special Senses

Structure of the eyeball slightly irregular hollow sphere with anterioir and posterior poles the wall contains three tunics - fir=brous, vascular, and sensory
fibrous tunic forms the outermost coat of the eye and is composed of: opaque (not see through) sclera (posteriorly) clear cornea (anterioirly)
sclera protects the eye and anchors the extrinsic muscles
cornea lets light enter the eye
vascular tunic uvea has three regions: chorioid, cilliary body, and iris
choroid a dark brown memebrane that forms the posterioir portion of the uvea (vascular tunic)
ciliary body smooth muscle bundles (cilliary muscles) surrounding the lens anchors the suspensory ligaments that holds the lens in place
iris the colored part of the eye regulates the amount of light entering the eye during: -close vision + bright light - pupils constict -distant vision - pupils dilate emotional state - pupils dilate when the subject matter appealing, problem solving
pupil central opening of the iris
sensory tunic retina photoreceptors that transduce (convert) light energy ganglion cell axons leave the eye as the optic nerve optic disc
optic disc site where the optic nerve (cranial nerve II) leaves the eye lacks photoreceptors (blind spot)
lens biconvex, flexible, avascular strcutrue that: -allows precise focusing of light onto retina -is composed of eptheilium and lens fibers light passing through a convex lens (as in the eye) is bent so that the rays coverage in a focal point
lens - when a convex lens form an image, the image is ___ and reveresed ___ upside down; right to left
posterior segement of eye is filled wtih vitreous humor - clear gell that trasnmits light supports posterioir surface of the lens
anteroir segement is filled with aqeous humour - clear liquid drains via the canal os Schlemm supports, nourishes, and removes waste
outer ear external auditory cananl (short curved tube filled with ceruminous glands) tympanic memebrane (eardrum; thin connective tissue that vibrates in response to sound)
middle ear tympanic cavity contains 3 small bones, malleus, incus and stapes tranmist vibratory motion of the ear drum to the oval window
inner ear bony labyrinth contains vestibule, cochlea, and semicurcular canals vestibulocochlear nerve (VIII) leaves the middle ear
vestibule suspended in its fluid are two sacs, the saccule and utricle these sacs house equlibrium recepots that respond to changes in head posititon
semicircular canals 3 canals that define each two-thirds of a circle and lie in the 3 planes of space the apmpulla houses equlibrium receptors that respond to angular head movmements
cochlea spiral, conical, bony chamber that contains organ or COrti and associated sterocilia (hearing receptors)
Created by: study222
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