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Observations on initial segments of axons in the prepyriform cortex of the rat
Author(s) -
Westrum Lesnick E.
Publication year - 1970
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.901390306
Subject(s) - biology , fixative , dendritic spine , golgi apparatus , cortex (anatomy) , neuroscience , electron microscope , spine (molecular biology) , anatomy , microtubule , axoplasmic transport , axon , microbiology and biotechnology , endoplasmic reticulum , cytoplasm , physics , hippocampal formation , optics
Layers II and III of the prepyriform cortex of rats were studied with the electron microscope and with a rapid Golgi method. Initial segments of axons were identified according to the criteria previously established. The fixative optimum for demonstrating microtubules and differentiating initial segments from dendrites must include glutaraldehyde. Initial segments were found to possess lateral projections, herein referred to as axonic spines and their fine structural features and synaptology are described. The synapses on initial segments and axonic spines predominately contain flattened vesicles and a spine apparatus‐like organelle is often present. The problem of the origin of these synapses is discussed.