Sensory Processes

PNS or CNS
nervous system

wherever spinal cord is cut - sensation loss below

discriminatory touch
proprioception
vibration

crude touch
nociception
temperature

% correct out of total

within the skin
within muscles and myotendinous junctions
within the joint capsule

monosynaptic reflex loop
assessing the afferent and efferent limb of that spinal segment
pathology can be within the PNS or CNS

receptor is in the muscle spindle
monosynaptic spinal response
with single afferent and efferent synaptic loop
PNS excitatory response of agonist, inhibitory response of antagonist
CNS controls intensity of response

dysfunction/disorders in the sensory limb as the message travels from the periphery to the SC will result in diminished or absent reflex response (PNS)

Disorders in the lower motor neuron either due to compression or trauma - result will be dimished or absent reflex response (PNS)

local disease or dysfunction at the neuromuscular junction in a single muscle will result in dimished or absent reflex response (PNS)

dysfunction in the descending pathway due to disease or injury at brain or spinal cord will result in increased excitation to stretch without inhibition (CNS)

group of muscles that are most representative of a single spinal nerve innervation

an area of skin supplied by nerves from a single spinal nerve root

last completely intact spinal nerve level

the impaired nerve
imapaired sensory distribution in that dermatome unilateral, reduced reflex response, impaired strength in myotome