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Definition
functional cells of nervous system
exhibit membrane excitability and conductivity, and secrete neuromediators and hormones |
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Definition
contains large, nucleus with nucleoli
ER with ribosomes, and ribosomes which stain as dark Nissl bodies |
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multiply, branched extensions of nerve body
conduct information toward cell body |
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long efferent process that projects from cell body
carries impulses away from cell body |
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| carry information from the CNS |
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| Interneuron or association |
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Definition
transmit information between neurons
located ONLY in the CNS |
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| one process which branches shortly after leaving cell body into axon dendrite |
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Definition
| one axon and one dendrite |
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| chemical changes (smell, taste) |
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| provide neurons with protection and nourishment |
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| aids in nourishing the neuronal process |
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| form the myelin sheat of CNS |
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Definition
provide essential nutrients to neurons and assist neurons in maintaining proper bioelectric potentials for impulse conductio nand synaptic transmission
Essential component of blood-brain barrier---particularly prominent in gray matter |
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Definition
| phagocytic cell that migrates into the CNS and is available for cleaning up debris following cellular damage and death |
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Definition
line ventricular system and choroid plexus
involved in production of cerebral spinal fluid |
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Term
| What are meninges composed of? |
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Definition
| two layers: periosteum of the skull and inner dura (meningeal layer) with venous sinuses between them |
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Definition
| longitudinal fold between cerebral hemispheres |
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| divides cranial cavity into anterior and middle fossa which lies above tentorium and posterior fossa which lies below (separates cerebrum from cerebellum) |
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| circulation to the spinal cord |
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Definition
anterior and posterior spinal arteries branch off the vertebral artery and descend alongside the spinal cord
venous drainage parallels arterial supply and drains into venous sinuses |
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| Peripheral nervous system (PNS) |
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Definition
| composed of cranial and spinal nerves: 31 prayers |
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mixed
have a num,ber of plexuses (networks of nerve fibers)- brachial, cervical, sacral, and lumbar |
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Definition
| can be sensory only, motor only, or mixed |
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| specific areas of cutaneous innervation from posterior rami of spinal nerve |
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| Autonomic nervous system (ANS) |
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Definition
two divisions
two-neuron motor conduction system (preganglionic and postganglionic neurons) |
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Term
| ANS Sympathetic division function |
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Definition
"fight or flight" syndrome
regulates vasomotor tone
BP regulation, HR increases, pupils dilate, become pale, digestive slows down |
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Term
| ANS Parasympathetic division function |
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Definition
opposite reaction to sympathetic system
increased stimulation produces relaxed state |
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