Lab 5 Sensory Perception Flashcards
Visual
Vision, light, photoreceptor, rods,cones
auditory
hearing, sund, mechanoreceptor,hair cells (cochlea)
vestibular
gravity, mechanoreceptors,hair cells(vestibular labyrinth)
somatosensory
somatic senses : touc, proprioception, temperature sense, pain, itch
touch
pressure,mecha,cutaneous mechanoreceptor
prioception
displacement,mechanore, muscle and joint receptors
temperature
thermal, thermorecep, cold and warm receptors
pain
chemical thermal mechanical, chemorecept, thermo, mecha, polymoidal/thermal/mechani nociceptors
itch
chemical chemorrecptor, chemical nociceptor
Gustatory
taste, chemical, chemorecpeor, taste buds
olfactory
smell, chemical, chemorec, olfactory sensory neurons
a decrease in sensitivity of the receptor despite maintenance of a constant strength stimuli
receptor adaptation
receptors produce action potentials as long as the stimulus persits
tonic or slow adaptation (cold)
receptors cause action potentials to be generated initially but return to their resting potential even though the stimulus continues to exist (heat)
phasic or fast adapting sensory receptor
the area on the skin that activates a sensory neuron
receptive field
the perception of the stimulus occurs in the cerebral cortex and causes characteristics electrical activity in different parts of the cortex
somatosensory receptors
Meissner’s
fine touch,light pressure- rapid adaptation
hair root plexus
touch, hair deflection, brushing, rapid/slow
free nerve endings
pain, temperature
pacinian corpuscle
deep pressure and vibration, rapid
merkels disc
touch, steady indentation, pressure, slow
ruffini’s end organ
deep pressure and stretch stimuli, rapid indentation, stretch, slow
somatosensory are not uniformly distributed instead they are
clustered or have different discrete locations
firing range
intensity
time course
duration
touch a subject with one point ask for description of where the touch occurred
tactile localization
used drafting compass with the point far apart determine 2 points
two point discrimination
two and half spirally coiled structure in the internal ear , contains the organ of corti on the spinal organ which is associate with sound perception
cochlea
sound waves enter through oval window then…
travel to 3 chambers ; cochlear duct, scala vestibuli, turbulence, scala media
electrical impulses generated by hair cells are transmitted by cochear branch of __
vestibulocochlear, VII cranial nerve
tuning fork used to determine the type of hearing loss
hearing test
auditory impulses from cochlea are not transmitted to the auditory cortex in the temporal lobes
sensorineural deafness
when sound is poorly conducted by bones of the skull from ear drum to the oval window
conduction deafness
test performed to check deafness : tuning fork in middle of forhead ; for sensorineural
weber’s test
sound heard in the middle of his head
normal
tone heard better in one ear and not on the other
abnormal
patient has conduction deafness when
patient heard louder sound in the deaf ear than in the normal ear
deaf ear
attenuation reflex is ineffective on ear resulting in the sound to be heard louder
test that allows differentiation between sensorineural and conduction deafness
Rinne’s Test
better hearing in deaf ear
conduction deafness
better hearing in the normal ear
sensorineural deafness
vestibular system
equilibrium
play important role in equilibrium
crista ampularis
help maintain static equilibrium / horizontal or vertical
maculae
refers to the reflex responses seen when the eyes follow a moving object
nystagmus
false sensation either the person or his world is rotating; sensation of dizziness
vertigo
gravity sensors in the vestibule
maculae
gelaniuos material contaiing small grains of calcium carbonate (otoliths)
otolithic membrane
response to dim light and provide blurry image gray tones
rods
yellow spot, respond only to bright light but provide sharply focused color images
cones
pigment made up of vitamin A and protein, enables color vision
rhodopsin
inability to see or distinguish between the different colors
color blindess
test used to detect color vision
Ishihara Charts
autonomic reflex that controls pupil size
accomodation
lens of the eyes changes shape in order to accommodate the image on the retina
near point of vision
where the photoreceptors are absent hence there is no visual input to the visual cortex
blind spot
visual acuity test
snellen chart
used to determine or test for field of vision for each eye
perimeter
