The Spinal Cord
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Created by:
tierracross on May 14, 2012
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19 terms
Terms | Definitions |
|---|---|
 Gray Matter | H-shaped; dendrites and neuron cell bodies |
| White Matter | Bundles of mylienated nerve fibers called spinal tracts |
| Ascending Tracts | Conducts impulses up the spinal cord to the brain |
| Descending Tracts | Conducts impulses from the brain down the spinal cord |
| Anesthesia | Loss of sensation |
| Paralysis | Loss of the ability to make voluntary movements |
| Sensory Neuron ( Afferent ) | Contains receptors that receive impuses from stimuli in tendons, skin, and motor neurons |
| Interneuron ( Association ) | OPTIONAL- conducts impulses between sensory neurons and motor nuerons. |
| Motor Nueron ( Efferent ) | sends impulses from spinal cord to an effector ( a muscle or gland ) |
| Reflex Center | The part of the reflex arc that is within the grey matter of the spinal cord. |
| Posterior Root Ganglion | Contain hundreds of sensory neuron cell bodies |
| Neurilemma | produces myelin AND allows for regenerations ( something CNS nerves CANNOT do because they do not have neurilemma ) |
| Cranial Nerves | -12 Pairs -attached to underside of brain -control areas NOT controlled by spinal nerves |
| Optic | For vision |
| Oculomotor | For eye movement |
| Vagus | controls digestive and heart activity |
| Spinal Nerves | -31 pairs -attached to spinal cord -controls impulses from all parts of the body except the tract the cranial nerves control |
| Sciatic | Largest nerve in the body |
| Sciatica | Inflammation of the sciatic nerve |
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