exam one (touch and pain) Flashcards
perceive fine touch and pressure and identify objects we touch, activated by mechanical stimulation
hapsis
perception of pain, temperature, and itch
nociception
perception of the location and movement of the body
proprioception
what receptors are sensitive to physical distortion
mechanoreceptors
body sensory receptor that responds briefly to the beginning and end of a stimulus on the body
rapidly adapting receptor
body sensory receptor that responds as long as a sensory stimulus is on the body
slowly adapting receptor
nocioception is slow or fast
slow
proprioception is slow or fast
fast
what mechanoreceptors are in the epidermis
meissners and merkels
what mechanoreceptors are in the dermis
pacinian and ruffinis
what mechanoreceptors are rapid
meissners and pacinian
what mechanoreceptors are slow
merkels and ruffini
what mechanoreceptors have a large receptive field
pacinian and ruffini
what mechanoreceptors have a small receptive field
meissners and merkels
the pacinian corpuscle has a ____ around its axon which allows a rapid adaptation
capsule
what corpuscles are encapsulated
meissners, ruffini, pacinian
all mechanoreceptors in the skin are ____
unmyelinated
the mechanoreceptor ion channels are opened by ___
force
where is the greatest mechanoreceptor density
fingertips
what are the four types of primary afferent axons
Aa, Ab, Ad. C
what is the fastest afferent axon
Aa (it is more myelinated and larger in diameter)
myelinated Ab axons are ___ ____ and branch in dorsal column
touch-sensitive
myelinated sensory axons ascend the dorsal column to where; what is this pathway called?
dorsal column nuclei (medulla), VP nucleus (thalamus), S1 (parietal lobe); medial lemniscal pathway
where does somatosensory information from the face come from (does not pass through the spinal column
trigeminal
where does the myelinated Ab axon cross over
medulla ( medial lemniscus)
located on the post central gyrus of the pareital lobe or area 3b are known as
primary somatosensory cortex
immediately adjacent to area 3b is an area that processes texture, what is it?
area 1
immediately adjacent to area 3b is an area that processes size and shape, what is it?
area 2
immediately adjacent to area 3b is an area that processes afferent info about body position, what is it?
area 3a
inputs from the VP nucleus of the thalamus go to layer ___ of the somatosensory cortex
IV
damage to the somatosensory cortex plays does not disrupt plans for making movements but instesad it disrupts
how and if the movements have been performed
area __ and __ are involved in complex somatosensory processing, they work to process somatic sensation, visual stimuli, and planning
5 and 7
what is the path of trigeminal nerve
principal sensory trigeminal nucleus, crosses over at thalamus (VP nucleus) and goes to specific spot of S1
