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.spinal nerves

how many spinal nerves are there 31 Pairs; 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal
Nerve divisions after leaving intervertebral foramen dorsal ramus, ventral ramus, meningeal ramus
dorsal ramus innervates muscles and joints of region
meningeal ramus re-enters vertebral canal
2 roots dorsal and ventral
dorsal roots afferent fibers from peripheral receptors
ventral roots efferent fibers
ventral rami split and merge these divisions form nerves pelxuses
nerve plexuses plexuses gives rise to branches or peripheral nervous system, most divisions carry motor and somatosensory fibers
plexuses parts cervical, brachial, lumbar, sacral, coccygeal
dermatomes sensory input from defined areas of the skin
characteristics of reflexes patterned response to a stimulus, may cause muscle contraction/glandular secretion
5 essential components of the reflex arc receptor, sensory neuron, integration center, motor neuron, effector organ
types of reflex arcs monosynaptic and polysnyaptic
monosynaptic reflex arcs knee-jerk reflex
polysynaptic reflex arcs flexor or crossed extensor reflexes
stretch reflex muscle is stretched which activates muscle spindles, impulses are sent through afferent fibers and then synapses
how does a a stretch reflex synapse through alpha motor neurons and interneurons
alpha motor neurons stretched muscle stimulated to contract
interneurons exhibits reciprocal inhibition
flexor and crossed extensor reflexes more processing occurs, involves coordination by cerebellum and cerebral cortex
Created by: kmartino91