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30 Cards in this Set

  • Front
  • Back
sensory receptor classification: traditional
sight
hearing
touch
taste
smell

other:
interoceptive (unconscious)
proprioceptors
chemical
thermal
balance
chemoreceptors
O2, CO2, H+, taste, smell
mechanoreceptors
pressure, tension, vibration, position
electroreceptors
fish - lateral line (can detect predators in dark)
magnetic field receptors
birds, sea turtles, dogs
thermoreceptors
heat/cold - pit vipers
photoreceptors
vision - pineal eye
nociceptors
pain/tissue damage
superficial
touch, pressure, flutter, vibration, tickle, warmth, cold, pain, itch
visceral
hunger, nausea, distention, visceral pain
sensory receptor potentials
vary with stimulus strength
not all-or-none
must reach threshold to produce an action potential
APS transmit information to CNS
sensory receptor amplification
can produce electrical signal containing greater energy than contained in the stimulus
first order neurons
primary afferent neurons
peripheral ending functions as sensory receptor or receives input from accessory sensory cell
cell body usually located in dorsal root ganglion or cranial nerve ganglion
second order neurons
usually located in spinal cord or brainstem
receives info from first order
transmits to neurons in thalamus
axon usually crosses midline of spinal cord (contralateral)
third order neurons
reside in one of sensory nuclei of thalamus
may transform info before transmitting to cerebral cortex
fourth order neurons
located in appropriate sensory receiving areas of cerebral cortex
process info further
higher order neurons
located in cerebral cortex
process info further
within some unknown site the infor results in perception
slow adapting receptors
long-lasting stimulus produces prolonged, repetitive discharge in primary afferent neuron
rapidly adapting receptors
long-lasting stimulus produces only a short-lived response
sensory coding
modality
location
intensity
frequency
duration
Pacinian corpuscles
high frequency vibration
pressure
nociceptors
mechanical, thermal, chemical damage
sclera
fibrous coat
gives structure to eye
conjuctiva
white part of eye
retina: rods
low light
no color
retina: cones
sharp images
color
optic disc
blind spot
where optic nerve exits eye
Canal of Schlemm
scleral venous sinus
drains aqueous fluid
relieves pressure (norm < 22 mmHg)
fovea
center of macula
most acute
no rodes
iris
radially (dilatory) and circulatory (sphincter) oriented smooth muscle