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refers to a collection of cells in the medial preoptic area demonstrated by Nissl stain in the macaque ( Paxinos-2009a ), the rat ( Swanson-2004 ) and the mouse ( Hof-2000 ). It is not found in the human ( Saper-2004 ). It is divided into a medial part of the medial preoptic nucleus and lateral part of the medial preoptic nucleus in all three species. The rat ( Swanson-2004 ) and mouse ( Dong-2004 ) have a central part of the medial preoptic nucleus as well. Functionally it is part of the behavior control column of the subcortical motor system ( Swanson-2004 ).
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refers to a subdivision of the preoptic area defined on the basis of Nissl stain. It is largely bounded medially by the preoptic periventricular nucleus and the anteroventral periventricular nucleus, laterally by the lateral preoptic area, dorsally by the anterior commissure and the thalamus, ventrally by the optic chiasm, rostrally by the nucleus of the diagonal band and caudally by the anterior hypothalamic area. It\'s internal structure varies considerably by species. In the human it is relatively undifferentiated ( Saper-1990 ). In the macaque ( Paxinos-2009a ), rat and mouse the area contains a well defined medial preoptic nucleus. In the rat ( Swanson-2004 ) and mouse ( Hof-2000; Dong-2004 ) the area contains four other nuclei as well: the anterodorsal preoptic nucleus, the anteroventral preoptic nucleus, the posterodorsal preoptic nucleus and the parastrial nucleus. The cell sparse portion of the area between nuclei is known as the medial preoptic area proper ( Swanson-2004 ).
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