lec exam 4 - chap 18

receptor

specialized cell that detects stimuli, sends to CNS

sensation

signal reaches your brain

perception

you consciously interpret it

general receptors

touch pain temp proprioception

special receptors

smell taste vision hearing balance

tonic

always active (photoreceptors)

phasic

on/off, respond to change

peripheral

receptor stops responding

central

brain ignores it

exteroceptors

outside (touch, temp)

proprioceptors

body position

interoceptors

internal organs

nociceptors

pain/damage

thermoreceptors

temperature

mechanoreceptors

touch/stretch

chemoreceptors

chemicals

olfaction

olfactory epithelium, BIPOLAR neurons, uses chemoreceptors

olfaction pathway

receptors, cribiform plate, olfactory bulb, brain

taste

taste buds on papillae, uses chemoreceptors

ear parts, external

sound in

ear parts, middle

ossicles, malleus incus and stapes

ear parts, inner

actual receptors

hearing process

sound, eardrum vibrates, ossicles move, oval window moves, fluid moves, hair cells bend, brain equates sound

hearing

happens in cochlea, organ of corti receptor, hair cells bend = signal

semicircular canals

detect rotation

vestibule urticle and saccule

linear movement and gravity

fibrous eye layer

sclera and cornea

vascular eye layer

choroid, iris, ciliary body

neural eye layer

retina

rods

dim light and night vision

cones

color and sharp vision

fovea centralis

best vision, cones only

optic disc

blind spot

vision pathway

retina, optic nerve, brain

baroceptors

stretch, blood pressure detection