chapter 17 notes - the special senses

7/25/2019 Chapter 17 Notes - The Special Senses

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Chapter 17 The Special Senses

Lobes of Cerebrum

Lobe Sense

Parietal Gustatory & Tactile

Temporal Olfactory & Hearing

Occipital Vision

Frontal NONE

Gustation: ense of Taste

o Tongue Taste

!eet " ali#a alty " ali#a

$itter " ali#a

our % Circum#allate

o Papillae of Tongue

' Filiform % increase surface area( most abun)ant( NO taste

bu)s( use) to )etect temperature an) te*ture

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+' Fungiform % taste bu)s on top( s!eet, salty, sour

-' Circum#allate ./0 % large( bitter( taste bu)s un)erneat1

2' Foliate % in#ol#e) in t1e sensations of taste an) 1a#e taste

bu)s embe))e) in t1eir surfaces( clustere) into t!o groupspositione) on eac1 si)e of t1e tongue

Olfaction: T1e ense of mell

o mell % +3,333* stronger t1an taste

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ense of Hearing

o 4natomy of Ear

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Ceruminus glan) pro)uces cerumen, also 5no!n as ear !a*'

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T1e Eustac1ian tube connects t1e mi))le ear c1amber to t1e

nasop1aryn*' Otitis 6e)ia "An infection from throat to ear.

Part Function Organemicircular canals 7ynamic E8uilibrium Crista 4mpularisVestibule tatic E8uilibrium 6aculaCoc1lea Hearing Organ of Conti

o Organs are al!ays foun) on t1e inner surface of t1e membranous

labyrint1

Crista 4mpullaris

o 7ynamic e8uilibrium % your bo)y sensing t1e fact t1at your bo)y is in

motion

o En)olymp1 % in semicircular canal( mo#es, triggering crista ampullaris

o 6ec1anical energy electrical energy

6o#ement of cilia electrical energy

Cupula 9 gelatinous membrane

6acula % same as crista ampullaris e*cept t1e cupula is calle) t1e otolit1ic

membrane

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o Otolit1s present % bob t1roug1 membrane, 1it t1e cilia an) )etect

gra#itational pull

Organ of Corti % same as t1e crista ampullaris e*cept t1e gelatinous

membrane is calle) t1e tectorial membrane

Vision

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o 4natomy of t1e eye

- layers:

o clera % Outer layer: ma)e of )ense connecti#e tissue #ery toug1; a5a

t1e !1ite of eyes'

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Cornea

Canal of c1elmm

o C1oroi) " 6i))le layer: 6elanocytes

Ciliary bo)y % smoot1 muscle

etina % o)s % blac5 an) !1ite( si)e of eye .retina0

o >1o)opsin .usual purple0 % nee) lig1t to be bro5en )o!n into scotopsinan) retinine

o cotopsin an) retinine transferre) into occipital lobe

Cones " color( bac5 of eye .retina0

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Less ben)ing an) refraction of lig1t

o Hypermetropia % farsig1te)ness( born !it1 eye too s1ort

Con#e* lens nee)e) to correct

o Presbyopia % el)erly sig1t

Lens loses elasticity an) can no longer accommo)ate

o Glaucoma % buil)up of a8ueous 1umor ma)e by an o#er pro)uction in

t1e ciliary bo)y'o Cataracts % )isease of t1e lens

o 4stigmatism % irregularity of t1e cornea

Cylin)rical .tauric0 lens nee)e) to correct

o Vitamin 4 % use) to ma5e retinine

$etacarotine

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chapter 17 notes - the special senses

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