Till-: LATERAL W'.'AT/.'/r/.A'.S 



middle part of the caudate nucleus. Several structures contribute to its floor: 

 (1) the stria termiualis of the thalanius, a line of white substance conforming to the 

 u r .'iiu of the internal capsule without, and constituting the lioundary l>et\\een the 

 caudate nucleus and the thalanius, and contain! us: ("_') the vena tenninalis (vein of the 

 corpus st rial u:u) ; (li) the lamina allixa. a medial continual ion of the st ria tenninalis 

 upon the surface of ( 1) the lateral part of the thalanius; (f>) the medial ediie of the 

 lamina ailixa, the henia chorioidca. and the chorioid plexus com inn inn; under (<>> the 

 edge (ta'iiia) of the body a nil the beiii nning posterior pillars of the fornix. 



The chorioid plexus of the lateral ventricle is continuous with that of the third 

 ventricle. The tela ehorioidea of the third ventricle (velum intcrposittim I con- 

 tinues under the ta'iiia of the fornix into the lateral ventricle, and there, along the line 

 of the t:enia ehorioidea. becomes elaborated into a varicose, convoluted, villus-like 

 frintre. rich in venous capillaries and lymphatics. This fringe is the chorioid plexus. 

 It is continuous in front, at the interventricular foramen, with the corresponding 

 plexus of the opposite lateral ventricle and with the chorioid plexus of the third 



l'i". 635. DIAGRAMMATIC THANSVKUSE SECTION op PROSENCEPHALON THROUGH BODIES OF 

 LATEKAL VENTKU-LKS AND MIDDLE OF THALAMENCEPHAIXJN. 



fit-Til \-KXTHH-I.I.: 





THJI.AMI-.1 



TI/IHIi 

 Vi'.V 1 I 



FOOT OF 

 1XTKKKAI. 

 CAPSfLK 



ventricle. The latter consists of two similar hut smaller fringes, which project close 

 together into the cavity of the third ventricle from the median portion of the under 

 surface of the tela ehorioidea. Behind, the chorioid plexus of the lateral ventricle 1 

 curves backwards and downwards into the inferior cornu, bein;; especially well- 

 developed at the region of its entrance into the latter, into what is called theglomus 

 chorioideum. Thoiurh apparently lying free in the ventricle, the chorioid plexus is 

 invested throughout by a layer of epithelium, the epithelial chorioid lamina, 

 which is adapted to all its uneven nesses of surface and which is a continuation of the 

 ependymal lininir of the remainder of the ventricle, continuous, on the one hand, 

 with that of the lamina aflixa and thalanius. and. on the other, with the epithelial 

 covering upon the upper surface of the ta'tiia fornicis and funbria. 



The posterior cornu of the lateral ventricle is a crescent ic cleft of variable length, 

 convex out wan Is, which is carried backwards from the posterior end of the body of th'- 

 ventricle and. curving medianwards. conies to a point in the occipital lobe. Its rutij 

 and lut, -nil trull are formed by a portion of the posterior radiation of the corpus cal- 

 lo-nm. which forms a layer, from its appearance known as the tapetum. In trans- 



