Abstract
The cellular morphology of the dog's area postrema (AP) was demonstrated with the Golgi-Cox technique. Golgi preparations suggested division of the canine AP into three regions: a periventricular mantle zone, a central region, and a junctional zone adjacent to the nucleus tractus solitarii. The distinctive feature of the dog's AP was arrays of periventricular neurons intermixed with glialoid cells. Additional Bodian sections revealed a commissural fiber network connecting the halves of the AP at the obex. The interconnected three-layer structure implies a polysynaptic pathway by which AP stimulation activates central sympathetic outflow.
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