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Morphological and cytochemical studies of synapses formed in culture between isolated rat superior cervical ganglion neurons

Neurons from the superior cervical ganglia (SCG) of perinatal rats were mechanically dissociated and established in culture by a method modified from that of Bray ('70). The neurons attached to the collagen substrate with some degree of reaggregation, and their rapidly growing processes soon formed an interconnecting network. Light and electron microscope examination showed that the morphology of the cultured cells resembled that of the SCG principal cell; neither satellite cells nor the small intensely fluorescent interneurons were observed. After six to seven days in culture, synapses were seen on both the principal cell somata and on their processes. After aldehyde fixation, the synapses contained clear, pleiomorphic vesicles; after KMnO4 fixation a variable number of the vesicles contained dense cores.