Journal of comparative neurology . limedii of the 28 mm. embryo,H91. X 50. Slide 28, Sect. 362. Fig. 6 Section through roof plate of telencephalon medium of the 28 , H 91. X 50. Slide 29, Sect. 367. although the pial surface still forms a regular curve, the ependy-mal surface shows a deep notch in the mid-line. The outlineof the ependymal surface is again indefinite owing to the looselyarranged cells. The marginal layer approaches almost to themidline. At the extreme anterior end of this region the notchdisappears; the ependymal outline becomes definite; and theroof plate thickens mar
Journal of comparative neurology . limedii of the 28 mm. embryo,H91. X 50. Slide 28, Sect. 362. Fig. 6 Section through roof plate of telencephalon medium of the 28 , H 91. X 50. Slide 29, Sect. 367. although the pial surface still forms a regular curve, the ependy-mal surface shows a deep notch in the mid-line. The outlineof the ependymal surface is again indefinite owing to the looselyarranged cells. The marginal layer approaches almost to themidline. At the extreme anterior end of this region the notchdisappears; the ependymal outline becomes definite; and theroof plate thickens markedly in an undoubted lamina terminalisffig. 20, ). DEVELOPMENT OF THE CHOROID PLEXUS 93 The tela chorioidea diencephali is very broad and very thin(fig. 11, Led.). It does not exhibit any folding except at theextreme anterior end. Toward the posterior end of the tela, anarrow strip of the alar plate is curved lateralward, resemblingthe rhomboidal lip of the rhombencephalon, and which we mayterm the thalamic lip (fig. 9, /./.).. Fig. 7 Sec-tion through the roof plate of (elcn(ei)li:il()ii moiliiiiii i>f the JN inembryo, H 91. X 50. Slide, 29, Sect. 372. Fig. 8 Section through the roof plate of te]cn(ei)h:il()n inediiiin in the 32 incinbrvo, H 41. X 50. Slide 32. Sect. 2. The thalamic lip carries with it lateralward the taenia thahiini(fig. 9, ) and the roof plate. Toward the anterior end of thetela, the thalamic lip bends laterally more and more until itspial surface comes into contact with the pial surface of the tha-lamic wall (fig. 11, ). The ependymal surface of the roof plateis hereby brought into contact with the ependymal surface ofthe thalamic lip (fig. 11). At the apex of the angle between thethalamic lip and the thalamic wall lies the stria medullaris (, ). The entire tela when viewed from above is wedge- 94 PERCIVAL BAILEY shaped, the anterior end being very broad. Heuser (13) hasnoted a similar condition in the pig. The commissura superioris
Size: 2007px × 1245px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorw, bookcentury1900, bookdecade1910, booksubjectmedicine
