Somatic Muscle in the Earthworm
نویسنده
چکیده
Neuromuscular transmission in invertebrates has been studied extensively (see Bullock & Horridge, 1965). However, the neuromuscular junctions in the earthworm have only been studied by Horridge & Robertes (i960). The present experiments were carried out to investigate the transmission in the neuromuscular junctions which could be recorded from the postsynaptic membranes of the longitudinal muscle of the earthworm. Excitatory junction potentials (E.J.P.'S) and miniature excitatory junction potentials (M.E.J.P.'S) could be recorded but they appeared only seldom. In contrast, inhibitory junction potentials (I.J.P.'S) and miniature inhibitory junction potentials (M.IJ.P.'S) were recorded from nearly all the cells in which microelectrodes were inserted. Therefore this paper describes mainly the properties of the M.I.J.P.'S and the I.J.P.'S generated from the longitudinal muscle; the properties of the E.J.P.'S and the M.E.J.P.'S are partly described.
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