Exercise 17 Histology of Nervous Tissue
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21 terms
Terms | Definitions |
|---|---|
 neurons | transmit messages |
| neuroglia | supporting cells |
| CNS neuroglia cells | 1. astrocytes 2. oligodendrocytes 3. microglia 4. ependymal cells |
| PNS neuroglia cells | 1. schwann cells 2. satellite cells |
| axon | nerve fibers, generate and conduct nerve impulses |
| neurofibrils | the cytoskeletal elements of the neuron, have a suport and intracellular transport function |
| dendrites | receptive regions (bear receptors for neurotransmitters released by other neurons) |
| axon terminals | small structures at the axon ends, or synaptic knobs, which form synapses or junctions with neurons |
| myelin sheath | a tight core of plasma membrane material that encompasses the axon |
| unipolar neurons | one very short process, which divides into peripheral and central proceses, extends from the cell body |
| bipolar neurons | two processes that are attached to the cell body - quite rare, most found in the eye and ear |
| multipolar neurons | many processes that extend from the cell body. all classified as dendrites except for a single axon. most neurons in the brain and spinal cord (CNS neurons) |
| sensory/afferent neurons | carry impulses from sense receptors in internal organs (towards CNS) yellow |
| motor/efferent neurons | away from CNS viscera or your body (skeletal muscles) orange |
| association neurons (interneurons) | found between sensory and motor pathways, connect both together green |
| nerve and ganglia | PNS |
| tract and nuclei | CNS |
| perineurium | covering fascicle |
| endoneurium | around one nerve fiber |
| epineurium | around roots of fascicle |
| fascicle | around groups of fiber |
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