AnatomyExamIStudyGuide - brain Collection of neurons...

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Neuron Part Description Cell Body Cytoplasm, contains nucleus Axon Conveys stimulus away from cell body Dendrite Conveys stimulus toward cell body Synapse Junction between axon and dendrite or cell body Myelin Fatty substance insulates axons, speeds up production in axons Nodes of Ranvier Gaps between Myelin where exchange can occur Neuron Type Cell Type Features Unipolar Sensory One process acts as dendrite and axon Bipolar Special Sensory One axon, one dendrite Multipolar Motor One axon, Multiple dendrites Nervous System Comparison Central Peripheral Parts Brain, Spinal Cord Support Cells -Schwann Cells: make Myelin -Satellite Cells - astrocytes :respond to injury - oligodendrocytes :cells that make myelin sheaths in CNS - microglia :eat cellular debris after injury - ependymal cells :make cerebral spinal fluid surrounding cavity in
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Unformatted text preview: brain Collection of neurons Nucleus Ganglion Collection of axons running together Tract Nerve White matter Contains mylenated axons Gray matter Core, many nerve cell bodies Dorsal root Bundles of sensory axons, bring info to spinal cord Dorsal root ganglion Bulge, unipolar nerve cell bodies Ventral root Bundles of axons that are leaving Spinal nerve (31 pairs) Mixture of incoming sensory and outgoing motor processes Dorsal ramus Supplies muscles of trunk Ventral ramus Supplies PNS muscles of lower extremity Thoraci c Lumbar Sacral T12 L1 L2 L3 L4 L5 S1 S2 S3 S4 S5 Lumbar Plexus (T12-L4) Obturator&Femoral N. (L2-L4) Sacral Plexus (L4-S4) Sciatic N. : Tibial N. (L4-S3) Common Paroneal N. (L4-S2) Superior Gluteal N. (L4-S1) Inferior Gluteal N. (L5-S2) Ligaments in Vertebral Column:...
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AnatomyExamIStudyGuide - brain Collection of neurons...

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