Abstract
AbstractThis study gives a quantitative description of hypoglossal neurons in the common boa, Constrictor constrictor. In this animal the hypoglossal nuclei are spatially distinct from the ventral horns and do not contain subnuclei. They contain a mean ± S.D. of 942 ± 162 neurons, many of which have double nucleoli. The neurons are shaped like prolate ellipsoids which are oriented with their long axes perpendicular to the ventricle. An average hypoglossal neuron has a major axis of 21.8 μ and a minor axis of 19.6 μ. Although neurons show a considerable range of sizes, neurons of different sizes are not segregated into different regions of the nucleus. Developmental differences in the size, distribution in the medulla, and the percentage of doubly nucleolated neurons occur, but the shape and orientation of hypoglossal neurons do not vary with age.
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