Term
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Definition
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Term
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Definition
| cranial nerves and spinal nerves |
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Term
| sensory (afferent) division |
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Definition
| conveys information TO the CNS from the sensory receptors (specific neurons or groups of neurons) |
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Term
| motor (efferent) division |
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Definition
| conveys information AWAY FROM the CNS |
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Term
| somatic (voluntary) nervous system |
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Definition
| innervates skeletal muscle |
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Term
| autonomic (involuntary) nervous system |
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Definition
| innervates smooth muscle, cardiac muscle and all glands --> sympathetic, parasympathetic |
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Term
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Definition
| respond to stimuli and conduct impulses |
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Term
| supporting cells (neuroglia) |
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Definition
| support and protect neurons |
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Term
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Definition
| function responsible for nutrition, growth, and repair of neuron |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| conduct incoming messages TOWARD cell body |
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Term
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Definition
| it generates and transmits a nerves impulse (action potential) and conduct nerve impulses AWAY from cell body |
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Term
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Definition
| portion of cell body from where axon originates |
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Term
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Definition
| one axon and many dendrites |
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Term
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Definition
| two processes: one axon and one dendrite |
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Term
| pseudounipolar (unipolar) neuron |
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Definition
| single process comes off the cell body and divides into two branches |
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Term
| sensory (afferent) neurons |
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Definition
| brings information TO the CNS |
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Term
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Definition
| take information FROM CNS to other parts of the body |
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Term
| association (interneurons) neurons |
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Definition
| help coordinate and integrate info between sensory and motor neurons within the CNS |
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Term
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Definition
| regulates transfer of nutrients from blood to the brain -- helps the workings of "blood-brain barrier" |
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Term
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Definition
| myelinate axons in CNS (myelination = process of wrapping an axon with myelin) - speeds up conduction |
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Term
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Definition
| phagocytize damaged neurons |
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Term
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Definition
| line central canal and ventricles - help circulate cerebrospinal fluid (CSF) |
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Term
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Definition
| surround neuron cell bodies in spinal ganglia |
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Term
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Definition
| group of neuron cell bodies located outside CNS |
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Term
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Definition
| myelinate axons in PNS --> neurolemmocytes |
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Term
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Definition
| process of wrapping an axon with myelin -- speeds up conduction |
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Term
| myelination procedure in PNS (4 steps) |
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Definition
1. Schwann cells wrap around a portion of an axon successively
2. cytoplasm and nucleus of schwann cell gets "squeezed" to the outside
3. inner successive layers of cell membrane make up the myelin sheath
4. schwann cells don't contact each other th're separated by nodes of ranvier. this allows for the electric impulses to "skip" along the axon |
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Term
| myelination procedure in CNS |
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Definition
| one oligodendrocyte myelinates portions of many axons |
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