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A cap of Nissl substance occurs at the base of the apical dendrite, however, and a number of cisternae of the Golgi apparatus occur in this same location. A centriole is often found here too, so that this region of the neuron represents the cell center. Little Nissl substance occurs in the dendrites, which mainly contain well\u2010ordered arrays of microtubules.<\/jats:p><jats:p>Projecting from the stem of the apical dendrite and from the secondary dendrites are spines. Basically, the spines are of three types. The most common ones have long, thin stalks and small end bulbs. The least common ones are mushroom\u2010shaped and have thick stalks ending in large bulbs. The other spines are short and stubby, and have no well\u2010defined stalk. The distribution of these three types of spines has been determined. Although they are rare, spines may also project from the cell body, which has very few synapses on its surface.<\/jats:p>","DOI":"10.1002\/aja.1001270402","type":"journal-article","created":{"date-parts":[[2005,2,26]],"date-time":"2005-02-26T19:33:20Z","timestamp":1109446400000},"page":"321-355","source":"Crossref","is-referenced-by-count":614,"title":["The small pyramidal neuron of the rat cerebral cortex. 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