. Text-book of normal histology: including an account of the development of the tissues and of the organs. barachnoideanspace. The corpus striatum consists of the special masses of gray matter,the nucleus caudatus and the nucleus lenticularis, and theirassociated tracts of nerve-fibres. The ventricular surface of the nucleus caudatus is coveredby a well-developed layer of ependyma, beneath which lies thezone of gray substance, containing nerve-cells of two kinds : largemultipolar cells (25-30 /i), and much more numerous smallerganglionic elements, whose size is about half that of the
. Text-book of normal histology: including an account of the development of the tissues and of the organs. barachnoideanspace. The corpus striatum consists of the special masses of gray matter,the nucleus caudatus and the nucleus lenticularis, and theirassociated tracts of nerve-fibres. The ventricular surface of the nucleus caudatus is coveredby a well-developed layer of ependyma, beneath which lies thezone of gray substance, containing nerve-cells of two kinds : largemultipolar cells (25-30 /i), and much more numerous smallerganglionic elements, whose size is about half that of the outer surface, of the caudate nucleus, directed towards theinternal capsule, is broken up by numerous bundles of fibres, whichpenetrate deeply into the gray mass and produce the characteristicwhite striae exhibited on section. 320 NORMAL HISTOLOGY The outer division, or the putamen, of the nucleus lenticu-laris closely resembles, both in color and in structure, the caudatenucleus, with which, indeed, it anteriorly becomes continuous. Thepaler color of the inner segments, the globus pallidus, depends. Section across anterior end of thalamus, striatum, and insula : th, anterior end of thalamus ; ,stria terminalis ; «.c., nucleus caudatus; «./., outer segment of nucleus lenticularis ; , , ex-ternal and internal medullary lamina receiving fibres (x) from caudate nucleus ; , internal capsule ;, external capsule; f/, claustrum; co,conex of island of Reil; , anterior commissure; g,central gray matter of third ventricle, a, its commissure; , section of anterior pillar of fornix;i, c, d, e, elements of subthalamic region; e^, stratum zonale of thalamus ; o, portion of optic tract.(After Schwalbe-Meynert.) not only upon the presence of greater numbers of meduUated fibres,but also upon the lighter tint of the yellowish pigment containedwithin the multipolar nerve-cells. The nerve-cells contained withinthe claustrum are principally fusiform elements whose
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