Nervous System
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Created by:
veryKOOL1326 on May 17, 2010
Subjects:
biology, Anatomy and Physiology I
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31 terms
Terms | Definitions |
|---|---|
 voluntary | using muscles under concious control |
| direct signals to the muscles | what is the job of the nerves? |
| cerebral cortex | divided into lobes; contains sulci (syn. to gray matter) |
| gyri | the folds of the brain |
| sulci | grooves or furrows between the gyri |
| fissures | grooves, depressions, and deep furrows on the cerebral cortex |
| Rolando | a major sulcus on the brain |
| frontal lobe | thinking, motor (moving parts of the body); in front of Rolando |
| parietal lobe | speech, sensory (perception of heat, cold, pressure, pain); behind Rolando and in left hemisphere |
| temporal lobe | hearing |
| occipital lobe | vision |
| medulla oblongata | does automatic tasks (regulates respiration and heart rate) |
| spinal chord | the medulla oblongata will eventually become this |
| cerebellum | muscle coordination and body balance |
| thinking, motor, sensory, speech, hearing, vision | the six jobs of the brain |
| frontal lobe | the largest part of the brain |
| lobes | divisions of the brain |
| soma | the main part of the neuron |
| nucleus | located in the soma; contains DNA |
| Nissl body | irregularly shaped particles in the cytoplasm of the neuron; maybe responsible for assembling proteins |
| microtubules | maybe carry proteins and other substances through the neuron |
| dendrite | directs incoming electrochemical signals toward the soma |
| axon | long, threadlike structure that electrochemical impulses pass through to leave the neuron |
| gray matter | area on the spinal chord that contains mostly dendrites and cell bodies; many neurons cross to the opposite side of the spinal chord through here |
| white matter | surrounds the gray matter on the spinal chord; divided into tracts |
| tract | collection of neuron fibers (axons) that travel to the same general place |
| ascending tracts | direct impulses toward the brain |
| descending tracts | direct impulses away from the brain |
| dorsal root | the branch of the spinal chord Y that enters through the back of the spinal chord |
| ventral root | the branch of the spinal chord Y that enters through the front of the spinal chord |
| spinal nerves | the 31 pairs of nerves on the vertebrae |
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