Quain's elements of anatomy . Fig. 684.—Transverse section of an embryo chick in the latter half of the second DAY, AT THE PLACE WHERE THE VERTEBRAL SOMITES CEASE. \^ (From Kollikcr.) r^v, dorsal ridges: rf, medullaiT groove or canal beginning to close ; uwp, proto-vertebral plate ; sp, lateral plate of the mesoblast; h, epiblast; dd, hypoblast; ao,primitive right aorta; sp, commencement of division of the mesoblast which forms the body cavity. Fig. 685.

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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy