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13 Cards in this Set
- Front
- Back
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Central nervous system |
-brain and spinal cord -incoming sensory and outgoing response -cells that begin and end in boundaries of brain and spinal cord |
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Peripheral nervous system |
-Nervous tissue that lies in periphery if nervous system -cranial and spinal nerves |
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Afferent divisions |
-incoming sensory -towards brain |
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Efferent divisions |
-outgoing motor -away from the brain |
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Somatic nervous system |
-Carry info to somatic effector (skeletal muscle). Somatic motor division -afferent division: give feedback from somatic effectors -integrating centers: receive sensory info,generate efferent respond |
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Autonomic nervous system |
-without voluntary control -efferent path carry info to autonomic (visceral) effectors (smooth muscle, cardiac muscle, gland, adipose) -afferent path: visceral sensory carry feedback to integrating center in CNS Two parts: -sympathetic: fight or flight -parasympathetic: rest and repair |
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Enteric nervous system (ENS) |
-in wall of gut (intestinal nervous system) -uses afferent/efferent in ANS -Integrators and feedback loops work independently |
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Neuroglia |
-Glial cells: retain capacity for cell division through adulthood Types: -astrocytes (CNS) -microglia (CNS) -ependymal (CNS) -oligodendrocytes (CNS) -Schwann (PNS) |
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Astrocytes |
-star shape, largest, most numerous -long points extend through brain tissue, attach to neuron and capillaries -feeds neurons: pick up glucose form blood converts to lactic acid passes along connected neuron -restores ion imbalances in ECF(k+) -coordinate production of new neurons and connections in development -recycles chemical transmitters at synapse -help form blood brain barrier: made of astrocytes and endothelial cells from wall of capillaries
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Microglia |
-stationary cells in CNS -Carry our phagocytosis of damaged tissue, microorganisms, and cellular debris |
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Ependymal cells |
-look like with epithelial cells -form thin sheets, like fluid filled cavities of brain and spinal cord -helps in making fluid that fills brain spaces (ventricles) -some have motile cilia: keeps fluid circulating in ventricles |
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Oligodendrocytes |
-Clustered around nerve cell bodies or arranged between nerve fibers in brain and spinal cord -produces myelin sheath around nerve fibers |
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Schwann cells |
-in PNS only -equivalent to oligodendrocytes -myelin sheath made by layers of schwann cell membrane: has fatty white myelin -node of ranvier: gaps in sheath between adjacent Schwann cells - white fiber is myelinated, grey fiber is unmyelinated -satellite cells: Schwann cells wrapped around nerve bodies for support at ganglia |
