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11 Cards in this Set
- Front
- Back
CNS
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central nervous system
controls muslces and secretion of the glands brain and spinal cord thoughts and memories are stored starts from brain to rest of the body |
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PNS
SNS ANS |
peripheral nervous system
the PNS have sensory are afferent neurons comes from senses to the brain motor; efferent from CNS to the Muscles and Glands SNS-somatic nervous system takes sensory neurons from the head, body, and limbs to the CNS and controls skeletal muscles ANS-autonomic nervous system control smooth muscle, cardiac muscle, and glands all involuntary |
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ANS
parasympathetic division sympathetic division |
parts of the ANS are
sympathetic division -speeds up heart beat parasympathetic division -slows heart beat |
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what is a neuron
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neuron is the path from which impulses travel from the body to the brain
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structure of neuron
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3 parts
cell body -collects nerve impulses dendrite -take the nerve impulses to the cell bodies axon -sends impulses to another neuron or tissue |
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When it is Afferent how do the impulses travel!?
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first it goes from the dendrite into the cell body into the axon into the brain!
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How do Efferent nerve impulses travel?!
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from the brain to the axon to the cell body!
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neuroglia
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support the neurons
6 different types:! 4 for CNS -astrocytes-participate in the metabolism of the neuro transmitters; maintain the proper balance of potassium; participate in brain developement and help form the blood brain barrier -oligodendrocytes-produce myelin sheaths around axons of neurons of CNS -Microglia- phagocytic cells that eat and destroy foreign debris in the CNS -Ependymal-line ventricles of the brain and the central canal of the spinal cord; and forms cerebral spinal fluid 2 for PNS -neurolemmocytes (schwan cells)- each produces part of the myelin sheath around a single axon of a PNS neuron -satellite cells- support neurons in ganglia of PNS ganglia are the little parts at the end |
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describe the meninges layers
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inside pia
middle arachnoid outside dura matter |
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white matter
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spinal cord: nerve impulse paths
brain: consists of myelated axons that transmits impulses between gryi in the same hemisphere transmits impulses between gyri |
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gray matter
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receives and integrates incoming and out going information
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