NUCLEUS 



879 



NUDIROSTRATE 



N. amygdala. N., Anterior {of the thalamus). 

 Nuclei. N., Arciform, an aggregation of nerve- 

 lls in the oblongata 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' nu- 

 cleus, and supposed to give origin to some of the 

 - of the middle root of the auditory nerve. It is 

 also called the nucleus vestibularis. N., Burdach's. 

 See X. funiculi cuneati. N., Caudal. See X., 

 -motor. N., Caudate. See Caudatum. N., 

 udo-ventral. See N. t Oculomotor. N. cere- 

 li, 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 des- 

 ate the gray substance of the restiform bodies. N., 

 eavage. Synonym of N. , Segmentation. N., 

 ughter. See Mitosis. N., Deiters'. See X. 

 igno-cellularis. N., Dental, the dental papilla, 

 dentatus, a nucleus located in the mesal part of 

 corresponding cerebellar hemisphere, in the 

 t prolongation of the prepeduncle which enters 

 and very close to the roof of the fourth ventricle, 

 is composed of a folded lamina of cinerea, con- 

 uted 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. 

 emboliformis, a small mass of gray matter situa- 

 in the interval between the A", dentatus and X. 

 . and lying nearer the former. It is elonga- 

 ted cephalo-caudad, and is probably an accessory de- 

 tachment of the N. dentatus. N. fastigii, the Fas- 

 tigatum ; a flat expanse of gray matter on each side 

 of the inferior vermis cerebelli, directly over the roof 

 of the fourth ventricle. N. fimbriatus. Synonym 

 of Corpus dentatum. N. funiculi cuneati, a mass 

 of gray matter in the posterior column of the oblongata, 

 lying beneath the funiculus cuneatus. N. funiculi 

 gTacilis, an elongated club-shaped mass of gray matter 

 the mesal portion of the posterior column of the 

 ongata. N. funiculi teretes, a distinct accumula- 

 of small nerve j elements, closely crowded, found 

 either side of the sulcus ventriculi of the oblongata, 

 relations are unknown. N., Germinal, the nucleus 

 ulting from the union of the male and female pro- 

 nuclei. N., Gingival, a part of the cerebellum in 

 fetus (between the third and fourth months), which 

 rs some resemblance to the gums. N., Globic, 

 globosus, the globulus, a number of small round 

 oval masses of cinerea situated in the interval be- 

 en the -V. dentatus and N. fastigii, lying near to and 

 probably an accessory detachment of the latter. N. 

 gracilis, a column of cinerea in the clava or posterior 

 pyramid of the medulla oblongata. N., Gray, the 

 cinerea of the spinal cord. N., Intraventricular, the 

 caudatum. N., Kolliker's, the cinerea surrounding 

 the canal of the myel (spinal cord). N., Laryngeal, 

 the nucleus of origin of the nerve-fibers of the larynx, 

 of Laura, the external auditory nucleus of nerve- 

 11s. N., Lenticular, N. lentiformis, a cluster of 

 cinerea of the striatum. N. of Luys, an almond- 

 shaped mass of cinerea with pigmented ganglion-cells 

 the regio subthalamica. N. magno-cellularis, 

 lets' Xucleus ; a nucleus of cinerea in the ob- 

 ta, situated mesad of the rostiform column at the 

 el entry of the auditory nerve-roots. It is proba- 



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bly a station for a spinal tract. N., Medullary, any 

 circumscribed collection of white matter in the central 

 nervous system. N., Mother. See Mother-star, 

 under Karyokinesis. N., Motor, a collection of 

 nerve-cells in the central nervous system giving origin 

 to a motor nerve. N., Oculo-motor, the nucleus of 

 the oculomotor nerve, lying dorsad of the posterior 

 longitudinal bundle, under the aqueduct of Sylvius. 

 N., Olivary. See Dentoliva. N. of Origin, the 

 collection of ganglion-cells in the central nervous 

 system giving origin to a nerve. N. of Pander, the 

 upper expanded end of the flask-shaped mass of white 

 yolk in the hen's egg. N., Post-pyramidal. See 

 jV. funiculi gracilis. N. pulposus, the pulpy sub- 

 stance in the center of the intervertebral discs, the 

 remains of the notochord. N. pyramidalis, the 

 inner accessory olivary nucleus. N. quintus, the 

 nucleus of the fifth or trigeminal nerve. N., Red. 

 See N. tegmenti. N., Restiform, the gray matter 

 of the restiform body. N., Roof. Synonym of A', 

 tegmenti. N. ruber. See N. tegmenti. N., Seg- 

 mentation, the nucleus that appears shortly after the 

 fusion of the male and female pronuclei, the last step 

 in the process of fertilization ; it is so called because 

 within it cleavage is first established. N., Spermatic. 

 Synonym of the male pronucleus. N., Stilling's. 

 Synonym of N. tegmenti. N., Subependymal, the 

 internal nucleus of the eighth or auditory nerve, lying 

 just beneath the ependyma of the metacele. N., 

 Tectorial Cerebellar. Synonym of X. tegmenti. 

 N., Tegmental, N. tegmenti, Red Xucleus ; a nu- 

 cleus with a reddish tinge and a round or oval outline, 

 situated in the isthmus at those section-levels where 

 the ganglion of Soemmering has its greatest extent. 

 N., Vesicular, a rather large nucleus, the membrane 

 of which stains deeply, while the central portion re- 

 mains relatively pale. N. vestibularis. See X. of 

 Bechterew. N., Vitelline, a nucleus resulting from 

 the fusion of the male and female pronuclei within the 

 vitellus. N., Westphal's, the nucleus of origin of 

 a part of the trochlear fibers ; it is situated posteriorly 

 to the trochlear nucleus proper. N., White, the 

 white substance of the dentate body of the olive. 



Nuculanium {nu-ku-la' -ne-um) [nucula, a little nut : 

 //., Nuadania~\. In biology, a fruit like the medlar, 

 containing several nut-like seeds or carpels. 



Nucule (nu'-kul) [nucula, & little nut]. In biology, the 

 female organ of Characece. 



Nude (tiiid) [nudus, naked]. Naked; bare. In biology, 

 destitute of hairs, leaves, feathers, and similar dermal 

 appendages. 



Nudibrachiate {nu-de-bra f -ke-af) [nudus, naked ; bra- 

 chium, the forearm]. In biology, having naked arms, 

 or non-ciliated tentacles. 



Nudibranchiate (nu-de-brang* -ke-at) [nudus, naked ; 

 bronchia, gills] . See Gymnobranchiate . 



Nudicaudate (nu-dik-aw' -ddt) [nudus, naked ; cauda, 

 a tail]. In biology, having a hairless tail. 



Nudicaul {nu'-dik-aivl) [nudus, naked; caulis, stem]. 

 In biology, having leafless stems. 



Nudiflorous {nu-diflo'-rus) [nudus, bare; flos, a 

 flower]. In biology, having flowers destitute of hairs, 

 glands, etc. 



Nudifolious (nu-difo'-le-us) [nudus, bare ; folium, a 

 leaf]. Having smooth leaves. 



Nudil {liu'-dil) [origin obscure]. An old name for a 

 medicated pledget, or dossil of wool, lint, or cotton. 



Nudiped (nu'-dip-ed) [nudus, naked; pes, foot]. In 

 biology, having naked feet. 



Nudirostrate {nu-de-ros'-trat) [nudus, naked ; ros- 

 trum, beak]. In biology, having a naked rostrum, as 

 a hemipterous insect. 



