Quain's elements of anatomy . Fig. 644.—LONGITTTBINAL SECTION OF THE BLASTODERM OP THE CHICK THEOUGH THEPRIMITIVE STREAK AND THE PART IN FRONT OF IT (frOm Balfour). , primitive streak ; ep, epiblast; hy, hypoblast in front of the primitive streak;n, nuclei in the yolk wall; yk, yolk. In a recent revision of the whole evidence on this question as applied to birds,Balfour and Deighton (No. 108), founding their opinion upon new and very carefulobservations made by them on the common fowl and duck, state that after thelateral expansion of the layer of mesoblast f oiTned in connection with the
Quain's elements of anatomy . Fig. 644.—LONGITTTBINAL SECTION OF THE BLASTODERM OP THE CHICK THEOUGH THEPRIMITIVE STREAK AND THE PART IN FRONT OF IT (frOm Balfour). , primitive streak ; ep, epiblast; hy, hypoblast in front of the primitive streak;n, nuclei in the yolk wall; yk, yolk. In a recent revision of the whole evidence on this question as applied to birds,Balfour and Deighton (No. 108), founding their opinion upon new and very carefulobservations made by them on the common fowl and duck, state that after thelateral expansion of the layer of mesoblast f oiTned in connection with the axial platethere takes place both in the region of the primitive streak and in the fore part ofthe germinal area a rapid proliferation of cells presenting a stellate character, andconnected below with the upper surface of the lower layer over the whole extentof the transparent area. These cells are at fii-st separate from the lateral partsof the axial mesoblastic plate, but below the primitive streak they are so inti-mately
Size: 2163px × 1156px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
