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23 Cards in this Set
- Front
- Back
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Central nervous system |
Brain and spinal cord |
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Peripheral nervous system |
Two divisions Sensory and motor |
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White matter in CNS |
Made of myelinated tracts Tracts connect one part of the brain to another, and to the spinal cord |
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Projection tracts |
Between cerebrum and rest of body |
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Commissural tracts |
Between left and right hemispheres |
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Association tracts |
Within the same hemisphere |
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Cerebrospinal fluid CSF |
Liquid that fills ventricles and canals of the CNS Originates as filtration of blood plasma Modified by ependymal cells |
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Choroid plexus |
Mass of blood capillaries surrounded by ependymal cells Not stationary- flow created by CSF pressure, cilia, and blood pressure |
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Functions of CSF Buoyancy |
Allows the brain to “float” allowing it to reach large size without being impaired by weight |
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Protection |
Stops brain from hitting cranium, shock absorption |
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Chemical stability |
Rinses metabolic wastes away and regulates chemical environment of nervous tissue |
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Special Sensory Areas Primary visual |
Occipital lobe- involved in visual perception |
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Primary auditory |
Temporal lobe- auditory perception |
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Primary gustatory |
Base of postcentral gyrus- receives impulses for taste |
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Primary olfactory |
Medial aspect of temporal lobe and inferior aspect of frontal lobe- receives impulses for smell |
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Functional organization of cerebellum- general sensory areas Somesthetic senses |
Includes touch, pressure, stretch, heat, cold, and pain |
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Primary somatosensory cortex (postcentral gyrus) |
Receives impulses for general senses |
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Somesthetic association area (parietal lobe) |
Analyzes general senses from somatosensory cortex |
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Motor Areas Primary motor cortex |
Precentral gyrus Neurons send signals for muscle contraction |
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Motor association area |
Frontal lobe Planned behavior |
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Cerebral/hemispheric lateralization |
Refers to the difference in function between the two hemispheres |
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Contralateral |
When origin and destination of a tract are on opposite sides of the body. Hemispheres receive information from opposite sides of the body. |
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Cerebellum |
Monitors muscle coordination, posture, and balance. Judges timing |
