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Synaptic analysis of inner plexiform layer in human retina
Author(s) -
Foos Robert Y.,
Miyamasu Walter
Publication year - 1973
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.901470403
Subject(s) - amacrine cell , inner plexiform layer , retina , biology , neuroscience , ribbon synapse , ganglion , outer plexiform layer , synaptic vesicle , genetics , vesicle , membrane
An ultrastructural synaptic analysis based on observations from 33 serial thin‐sections of the inner plexiform layer in a volume sample of midperipheral human retina is presented. Of the 152 identifiable neuronal processes 7lpar;total 187) 14 were bipolar, 112 amacrine, and 26 ganglion. One hundred and forty‐seven synapses were present — 31 bipolar (ribbon) and 116 amacrine (conventional). The ribbon synapses were divided on the basis of their postsynaptic processes into: amacrine, ganglion (16); amacrine, amacrine, ganglion (9) amacrine, amacrine (3) amacrine, amacrine, amacrine (1) ganglion (2), both incomplete in sections(. Of the 116 conventional synapses, 28% were amacrine‐bipolar, 34% amacrine‐amacrine and 38% were amacrine‐ganglion. The occurrence of extra amacrine process(es) and the occasional absence of a ganglion cell dendrite at bipolar (ribbon) synapses, as well as the relative abundance of amacrine‐amacrine (conventional) synapses, suggests a relatively greater role of amacrine cells in mediating visual transformations in the midperipheral human retina than has been described previously.