Nucleus

(nu'-kle-us). The e ential part of a typical cell, usually round in outline, and situated near the center. Tin around which the ma of a crystal aggreg the central element in a compound, us the carbon in hydrocarbons. In physiology, the controlling or motot center of a muscle or organ; also, the deep (nidus or nidulus) of a nerve. N. ambiguus. N.. Anterior, a center near that of the vagus. N. amygdalae, an irregular aggregation of cinerea situated the apex of the temporal lobe of the brain. Ix ' it and the apex of the middle ventricular horn; II lies ventrad of the lenticula. N., Amygdaloid. N. amygdala. N., Anterior (of the thalamus). Nuclei. N., Arciform, an aggregation of nervells in the oblong at a between tiie pyramidal tracts the arciform fibers. N., Arcuate, the largest the collections of gray matter in the arciform fibers the pyramidal tracts. N., Balbiani's, a nucleus sposed to be present in all ova, in addition to the jinal vesicle. Its function is to be the separation the contents of the ovum into a germinal part and lutritive portion. N. of Bechterew, an ill-defined group of ganglion-cells lying dorsad of Deiters' nucleus, and supposed to give origin to some of the - of the middle root of the auditory nerve. It is also called the nucleus vestibular is. N., Burdach's. See X. funiculi cuneati. N., Caudal. See X., -motor. N., Caudate. See Caudatum . N., udo-ventral. See N.t Oculomotor. N. cereli, the corpus dentatum, q. v. N., Cervical, an mulation of nerve-cells in the upper part of the al cord, opposite the third and fourth cervical ves. N. cinereus, a term sometimes used to desate the gray substance of the restiform bodies. N., eavage. Synonym of N., Segmentation. N., ughter. See Mitosis. N., Deiters'. See X. igno-cellular is. N., Dental, the dental papilla, dentatus, a nucleus located in the mesal part of corresponding cerebellar hemisphere, in the t prolongation of the pre peduncle which enters and very close to the roof of the fourth ventricle, is composed of a folded lamina of cinerea, conuted like the similar nucleus of the olive, and is n cephalo-mesad. N. de reliquat, a granular iated with the sickle-shaped rods in coccidia. emboli form is, a small ma of gray matter situain the interval between the A", dentatus and X.. and lying nearer the former. It is elongated cephalo-caudad, and is probably an acce ory detachment of the N. dentatus. N.