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Fine structure of the synaptic endings on the Mauthner cell of the goldfish
Author(s) -
Nakajima Yasuko
Publication year - 1974
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.901560402
Subject(s) - osmium tetroxide , axon hillock , axon , synapse , dendrite (mathematics) , vesicle , anatomy , free nerve ending , biology , synaptic vesicle , biophysics , postsynaptic potential , mauthner cell , neuroscience , electron microscope , fish <actinopterygii> , biochemistry , physics , geometry , mathematics , receptor , membrane , optics , fishery
This study has investigated the fine structure of the Mauthner cell of the goldfish. The animals were divided into three groups of three fish and each group was perfused with one of the following fixatives: osmium tetroxide, glutaraldehyde, or formaldehyde. Large myelinated club endings and smallvesicle boutons (SVBs) are found on the distal part of the lateral dendrite. The club endings have the structure of the mixed synapse and contain large, round synaptic vesicles. The SVBs, appearing as small boutons, show structural features of the chemical synapse, and contain small synaptic vesicles, which are round when fixed with osmium tetroxide, but become elongated when fixed with aldehyde fixatives. Small myelinated club endings, SVBs, and large‐vesicle boutons (LVBs) are observed on the proximal part of the lateral dendrite, on the ventral dendrite, and on the cell body (excluding the axon hillock region). The LVBs, mostly appearing as large boutons, show the structure of either the mixed or the chemical synapse. They contain large, round vesicles. On the axon hillock and initial axon segment, there exist unmyelinated club endings containing medium‐size elongated vesicles and spiral fiber endings containing round medium‐size vesicles. An attempt was made to correlate these different types of endings within physiological functions.