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CNS anatomy test

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laurabockoff's version from 2017-02-02 10:55

Section 1

Question Answer
CNSconsists of the brain and spinal cord; located in the dorsal cavity and main function is integrating impulses and making a decision what needs to be done
PNSconsists of nerves extending from the CNS; main function is communication
somatic sensory fibersfibers that send impulses to the CNS. Fibers originate from the skeletal muscles, skin, and joints
visceral fibersfibers that send impulses to the CNS. Originates from the internal organs
Autonomic nervous systemstimulates the involuntary parts of the body ex) smooth, cardiac, muscle, glands
Somatic nervous systemstimulates the voluntary parts of the body ex) skeletal muscle. Reflexes are still involuntary
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Section 2

Question Answer
Neurogliasupporting cells that make up nervous tissue. Located in the CNS. Main functions are protection
microgliaphagocytic cells that eat bacteria and dead brain tissue
Ependymal Cellsline the brain and spinal cavity. Contains cilia which spreads CSF (celebrospinal fluid) evenly throughout the dorsal cavity. This fluid cushions the brain and spinal cord
Astrocytesstar-shaped cells that bind nerves to the blood supply and help form the blood-brain barrier
Satellite Cellscushion and protects nervous tissue
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Section 3

Question Answer
Schwann Cellsproduce Myelin Sheaths
cell bodythe control center of the nerve. Contains a nucleus and cytoplasm
Dendritesbranch-like and numerous on nerve cell. Receives impulses and sends them to the cell body
Axonsingle- extension. May be extremely long or short and they send the impulse to the axon terminals (away from the cell body)
Nodes of ranviera gap in the myelin sheath of a nerve, between Schwann cells.
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Section 4

Question Answer
Gangliaclusters of cell bodies found outside the CNS (in the PNS)
tractsbundles of nerve fibers inside the CNS
afferent neuronssends impulses to the CNS
efferent neuronssends impulses from the CNS out to a body part or region
reflexesan action that is performed as a response to a stimulus and without conscious thought
reflex arcsthe neural pathway a relex travels through.
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