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central nervous system (spinothalamic tracts goes from the spinal cord to…
central nervous system
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100mil neurons and neuroglia compromise the spinal cord, part of the CNS that extends from the brain.
spinal cords and spinal nerves contain reflex circuits that control rapid reactions to environmental changes
gray matter- site for integration of postsynaptic potentials
white matter- major sensory and motor trails to and from the brain.
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cauda equina - roots of the lower spinal nerves, cervical thoracic, lumbar sacral regions, spinal nerves
dura matter - outer , arachnoid matter- middle, pia matter-inner
in the spinal cord white matter is on the outside and gray matter is on the inside. in the brain white matter is on the inside and gray matter is on the outside.
white matter of cord consists of nerve axon which transmits electrical information between limbs, trunk and organs of the body.
internal to this peripheral region is the butterfly shaped central gray matter made of nerve cell bodies around the central canal
anterior gray horns consist of somatic motor neurons
posterior gray horns consist of sensory neurons
site of synapse between first order
sensory neurons coming in from the periphery and secondary neurons which either ascend in the cord or exit back as parts of reflex arcs
inter neurons are found totally within the spinal cord grey matter
axons run up and down the spinal cord in tracts. tracts are bundles of axons that are located in specific areas of the cord and are travelling to the same place in the brain or the cord.
spinothalamic tracts goes from the spinal cord to the brain
corticospinal tract goes from the cortex to the spinal cord
different motor tracts convey nerve impulses from specific areas of the brain to the body
nerve impulses for specific senses are carried in specific sensory tracts
lateral control of the movements of hands and the feet
anterior controls movement of the trunk and limbs
posterior touch n proprioception lateral pain and temp
dermatome- area of skin that is innervate by a single spinal nerve, indicated by the letters and number of a particular segmental nerve