Chapmans Reflexes Flashcards
describe a monosynaptic reflex
primary afferent neuron
one synapse
central motor efferent neuron
where is the cell body in the afferent sensory neuron located
in the dorsal root ganlion
2 types of primary afferents?
small cell body: lightley myelinated or unmyelniated, beta afferent, crude, touch, nociceptor
Large cell body
- myelinated alpha-afferent
- proprioception, discrimination mechanoreceptors
where is the cell body of the motor efferent neuron located
the ventral horn of the spinal cord
what is a polysynaptic reflex circuit
utilize interneurons between afferent and motor efferents
-many modulations possible
nerves involved in autonomic reflex arc
cranial nerves
spinal nerves
splanchnic nerves
autonomic reflex arc: afferent nerve of relex
neuron to viscera/blood vessel—>cell body in dorsal root ganglia—>central process terminates in dorsal horn on:
motor efferent or interneuron
efferent nerve of reflex cell body location
in lateral horn of cord or brain stem nuclei
efferent nerve reflex (preganglionic) axons can be ____ or ____
myelinated or unmyelinated
Myelinated: terminate on ganglion neurons outside CNS
on fascia of body wall or organs
unmyelinated preganglionic axons: travel from ganglia to cell targets of visceral organs
ANS has _____ efferent neurons in the pathway and somatic PNS has ___
2,1
ganglionic neurons of the ANS are in 3 locations
1) paravertebral ganglia (symp trunk)
2) collateral ganglia (clusters along large vessels of abdominal cavity)
3) hypogastric ganglia (fasica of visceral organs of pelvis)
somato-somatic reflex is what?
example?
afferent axon from somatic structure
efferent motor to somatic structure
-may have at least 1 interneuron
-example: touch hot object
visceral-visceral reflex
sensory from viscera to cord
efferent motor to viscera via ANS
-example: distended bowel reflexing back to cause spasm in muscular layer of bowel
viscero-somatic/somato-visceral reflex
- interneurons yes or no?
- what type of pain?
afferent sensory axon from viscera or somatic structure
efferent motor terminates on somatic or visceral structure
-interneurons involved
-referred pain
-visceral pain referred to somatic structures (appendicitis)
myocardial infarction is what type of reflex with referred pain
viscero-somatic
- artery clots = sensory to cord
- output to shoulder/neck/arm/symp system = motor output
treatment of the spinal level will do what to the visceral problem
will not cure it but will decrease visceral efferents thus calming of abnormal reflexes