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Term
Definition
Stuff to Know
Spinal Cord   the portion of the central nervous system within the spinal canal of the vertebral column   extends from Foramen Magnum --> 2nd Lumbar Vertebra - conducts impulses To/From via spinal "Tracts"  
Gray Matter   contains nerve cell Bodies, Dendrites, Synapses - Non-Myelinated   differentiated into Anterior and Posterior Horns  
White Matter   forms Ascending (SENSORY fibers) and Descending spinal tracts - Myelinated   Descending = MOTOR fibers; Ascending = SENSORY fibers  
Central Canal   the small canal running through the center of the spinal cord   leads to 4th ventricle of brain - contains CSF  
Spinal Nerves   any of the nerves that arise in pairs from the spinal cord. There are 31 pairs of spinal nerves identified by vertebral region (ie T-8 L = below Left T-8 vertebra)   pass through Intervertebral Foramen  
Dorsal Root   the more posterior of the two nerve fiber bundles of a spinal nerve that carries sensory information to the central nervous system.   SENSORY nerve ENTRY point  
Dorsal Root Ganglion   any of the sensory ganglia situated on the dorsal root of each spinal nerve.   SENSORY never cell Bodies  
Ventral Root   The part of a spinal nerve that arises from the anterior section of the spinal cord   MOTOR nerve EXIT point  
Plexus   Merging network of spinal nerve trunks   leading TO and FROM a specific bodily area through the spinal cord  
Cervical Plexus   Merging network of spinal nerve trunks   head, neck, upper chest and back  
Brachial Plexus   Merging network of spinal nerve trunks   shoulder arm and hand  
Lumbar Plexus   Merging network of spinal nerve trunks   Lower back, abdomen, genitalia, thigh  
Sacral Plexus   Merging network of spinal nerve trunks   buttocks, Posterior thigh, calf, foot  
Meninges   protective membrane covering the brain/spinal cord   made up of the Dura Mater, Arachnoid Membrane, and Pia Mater  
Dura Mater   Outermost, watertight, toughest Meninx   dense, Irregular connective tissue - surrounded externally by blood vessels and fat  
Arachnoid Membrane   2nd layer Meninx   Squamous Epithelium and Elastic connective tissue - encloses Subarachnoid Space  
Pia Mater   vascular Areolar membrane supporting blood vessels   closely adherent to the Spinal Cord and Brain  


   





 
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