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Particular attention is paid to the synapses involving the surface of different parts of these neurons. Only symmetric synapses occur on the somata of spiny stellate neurons, and these occur with a frequency of 11.0\u201315.9 synapses\/100 \u03bcm<jats:sup>2<\/jats:sup> perikaryal surface. Symmetric synapses also occur on dendritic shafts and, occasionally, on dendritic spines. Asymmetric synapses are occasionally present along the dendritic shafts of spiny stellate neurons, but the majority of asymmetric synapses (75\u201395%) occur on their dendritic spines. The initial axon segments of the smallest spiny stellate neurons possess no axo\u2010axonal synapses, but several symmetric synapses are present along the initial segment of a medium\u2010sized, spiny stellate neuron in layer 4B. Fifty\u2010three synapses made by boutons of the axons of these spiny stellate neurons have been identified, and all are asymmetric. Sixty per cent of the synapses are formed by boutons en passant and the remainder by the terminal swellings of spine\u2010like axonal appendages, boutons terminaux. Of the synapses formed by the axons of spiny stellate cells, axo\u2010spinous synapses outnumber axo\u2010dendritic synapses two to one, and axo\u2010dendritic synapses involve both spinous and aspinous dendrites. Evidence is presented which suggests that many of the axon terminals forming asymmetric synapses with the dendritic shafts and spines of spiny stellate neurons are derived from other spiny stellate neurons.<\/jats:p>","DOI":"10.1002\/cne.902330205","type":"journal-article","created":{"date-parts":[[2005,1,1]],"date-time":"2005-01-01T19:27:10Z","timestamp":1104607630000},"page":"213-235","source":"Crossref","is-referenced-by-count":69,"title":["The morphology and synaptic connections of spiny stellate neurons in monkey visual cortex (area 17): A golgi\u2010electron microscopic study"],"prefix":"10.1002","volume":"233","author":[{"given":"Richard L. Saint","family":"Marie","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alan","family":"Peters","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2004,10,9]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.03-07-01389.1983"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/cne.901860310"},{"key":"e_1_2_1_4_1","first-page":"531","article-title":"Age\u2010related alterations of the proximal axonal segment in lamina IIIab pyramidal cells of the human isocortex: A Golgi and fine structural study","volume":"21","author":"Braak E.","year":"1980","journal-title":"J. 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