By Eduardo D.P. De Robertis, P. Alexander and Z. M. Bacq (Auth.)
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3-1, C and 3-2, B). According to Palay (1958), the complex formed by a cluster of synaptic vesicles associated with an area of the pre synaptic membrane and the subjacent synaptic cleft may be considered as a morphological sub-unit of the synaptic membrane. These local synaptic complexes may be the active points of the synapse at which the actual transmission of the impulse takes place. Both the presynaptic and subsynaptic membranes are separated by an intervening synaptic cleft of 120 Â to 200 Â or more.
Guillery). While the presence of rings and loops may be a valid criterion for nerve endings, a negative result does not imply the absence of ter minals, since the lack of axonic fibrillary material may preclude the attaining of the ending proper (see also Chapter 2). The Subsynaptic Cytoplasm The submicroscopic structure of the subsynaptic cytoplasm va ries considerably according to the site of contact since this may be a dendrite, the perikaryon or an axon. The different components observed in these regions of the neuron can thus be observed (De Robertis, 1955^).
It is interesting that these postsynaptic densities are confined to the zone of primary contact and do not extend into the deeper parts of the folds. The synaptic vesicles accumulate preferentially near the junction. Birks et al. (I960*) describe in the ending a mitochondrial region adjacent to the Schwann cover, and a "vesicular region" near the muscle surface. In this latter region the vesicles tend to concentrate in the zones apposite to the post junctional folds (Fig. 4-3). Some possible physiological implications of these findings are described in Chapter 5.