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Definition
carry or move inward toward a central structure
afferent "impulses" travel toward the central nervous system |
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carry or move away from a central structure
In the nervous system "impulses" move away from the central nervous system |
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Definition
"transmit" impulses
3 major structures
- cell body
- axon
- dendrite
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Term
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Definition
| membranes covering the brain and spinal cord |
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| PNS Peripheral Nervous System |
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Definition
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Definition
| Protective mechanism that blocks specific substances found in the bloodstream from entering delicate brain tissue |
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Term
PNS
Peripheral Nervous System |
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Definition
| The peripheral nervous system (PNS) is composed of all nervous tissue located outside the spinal column and skull. It consists of sensory neurons, which carry impulses from the body to the CNS (afferent), and motor neurons, which carry impulses from the brain and spinal cord to muscles and glands (efferent). It is further divided into the somatic nervous system and the autonomic nervous system, which is subdivided into the sympathetic and parasympathetic divisions. |
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Definition
| The (9) thalamus receives all sensory stimuli except olfactory and processes and transmits them to the appropriate centers in the cerebral cortex. In addition, the thalamus receives impulses from the cerebrum and relays them to efferent nerves. |
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Definition
| Motor impulses transmitted to muscles under conscious control (walking and talking) belong to the somatic nervous system. |
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Definition
Motor impulses transmitted to glands and muscles not under conscious control (heart rate, respiration, digestion, pupil diameter, and so forth) belong to the autonomic nervous system.
- sympathetic
- parasympathetic
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