Viscerosomatic and Chapman's Reflexes Flashcards
What’s a reflex
relationship between an input stimulus to the body and an output action to either a muscle or a secretory organ
myotatic reflex
tonic contraction of the muscles in response to a stretching force, due to stimulation of muscle receptors
Where do reflexes occur in spinal cord?
Gray Matter
How many layers are in gray matter?
10 layers (Rexed)
Which layers in gray matter are afferents from body synapsing at?
upper layers 1-6
Layer 3,4 of gray matter made of what?
mechanoreceptors
Layer 1,5 of gray matter made of what?
A (delta) fast pain fibers
Layer 2 of gray matter made of what?
small c fibers of slow pain
what are lower layers of gray matter made of?
interneurons and motoneuron cell bodies
what percentage of interneurons receive input from both visceral and somatic afferents?
70-80%
Somatic Component of disease
MSK palpatory findings may correlate with visceral disturbances
Habituation
Opposite of sensitization
- Process of decreasing response of a neural pathway with a continuous stimulation
Sensitization
Stimulus is repeated at a rate of once very second or two until a stable response level is reached that can continue at increased level as long as stimulus is continued
Habituation and sensitization together exist to…
help maintain a homeostasis between over-reaction and under-reaction to a stimulus
Facilitation
Maintenance of a pool of neurons in a state of subthreshold excitation
Nociception
pain receptors bring pain sensation to body
-none in brain or hyaline cartilage
Facilitated Segment
skeletal muscle and sympathetic nervous system
Allostasis
Long term neural effect of segmental facilitation
-Stimulus applied to tissue, chemical soup of inflammation, cause primary afferent sensitization, results in hyperalgesia (exaggerated response)
somatosomatic
localized somatic stimuli producing patterns of reflex response in segmentally related somatic structures
somatovisceral
localized somatic stimulation producing patterns of reflex response in segmentally related visceral structures
viscerosomatic
localized visceral stimuli producing patterns of reflex response in segmentally related somatic structures
viscerovisceral
localized visceral stimuli producing patterns of reflex response in segmentally related visceral structures
