endplate, end-plate

endplate, end-plate
- motor e. the large and complex end-formation by which the axon of a motor neuron establishes synaptic contact with a striated muscle fiber (cell); several terminal branches of a motor axon end in irregular, club-shaped synaptic end-formations that are bedded in a single troughlike depression of the muscle fiber's surface; the postsynaptic membrane, the sarcolemma that forms the bottom of the trough, is greatly increased in surface area by deep infoldings protruding into the underlying cytoplasm of the muscle fiber; the subsynaptic interval between the plasma membrane of the axon terminals and the sarcolemma is filled with an amorphous substance; the trough is closed off toward the surface by the Schwann sheath, which peels away from the axons as the latter enter the trough and thus forms a lid over the trough; the slight bulge of this closure plate corresponds to Doyère eminence. SYN: sole-plate ending.

Medical dictionary. 2011.

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Look at other dictionaries:

  • end-plate — noun the flattened end of a motor neuron that transmits neural impulses to a muscle • Syn: ↑endplate, ↑motor end plate • Hypernyms: ↑end organ • Part Holonyms: ↑effector …   Useful english dictionary

  • motor end plate — noun the flattened end of a motor neuron that transmits neural impulses to a muscle • Syn: ↑end plate, ↑endplate • Hypernyms: ↑end organ • Part Holonyms: ↑effector * * * noun …   Useful english dictionary

  • endplate — end plate n. The area of synaptic contact between a motor nerve and a muscle fiber. * * * …   Universalium

  • end organ — noun a specialized structure at the peripheral end of some motor or sensory nerve fibers • Hypernyms: ↑organ • Hyponyms: ↑end plate, ↑endplate, ↑motor end plate, ↑osmoreceptor …   Useful english dictionary

  • endplate — noun the flattened end of a motor neuron that transmits neural impulses to a muscle • Syn: ↑end plate, ↑motor end plate • Hypernyms: ↑end organ • Part Holonyms: ↑effector …   Useful english dictionary

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  • ending — 1. A termination or conclusion. 2. A nerve e.. annulospiral e. one of two types of sensory nerve e. associated with a neuromuscular spindle (the other being the flower spray e.); after entering the muscle spindle, the fiber divides into two flat …   Medical dictionary

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