Page 535 - My FlipBook
P. 535
:
GENERAL ACCOUNT OF EMBRYONIC DEVELOPMENT. 545
pole, we are better prepared to take up the study of the more compli-
cated processes as seeu iu the evolution of the ovum of the rabbit as it
develops into the embryo.
After leaving the ovaries the ovum of the rabbit passes slowly down
Fig. 288.
Three Stages in the Segmentation of the Rabbit's Ovum 'from Quain's Anatomy, after Bischoff )
A Nhows the division of the ovum into two nearly equal masses; H, the formation of four spheres
by division of the two of the preceding stage; C, the stage with eight segmentation-spheres.
Fig. 2
Optical Section of Rabbit's Ovum at the Close of Segmentation (from Balfour, after Ed. van Beneden) :
ep, epiblast; hy, primitive hypoblast; bp, spot where the epiblast has not yet grown over the
hypoblast.
the Fallopian tube, where it meets the spermatozoa, impregnation taking
place in the upper third of that tube, and the ovum reaching the uterus
Vol. I.—35
GENERAL ACCOUNT OF EMBRYONIC DEVELOPMENT. 545
pole, we are better prepared to take up the study of the more compli-
cated processes as seeu iu the evolution of the ovum of the rabbit as it
develops into the embryo.
After leaving the ovaries the ovum of the rabbit passes slowly down
Fig. 288.
Three Stages in the Segmentation of the Rabbit's Ovum 'from Quain's Anatomy, after Bischoff )
A Nhows the division of the ovum into two nearly equal masses; H, the formation of four spheres
by division of the two of the preceding stage; C, the stage with eight segmentation-spheres.
Fig. 2
Optical Section of Rabbit's Ovum at the Close of Segmentation (from Balfour, after Ed. van Beneden) :
ep, epiblast; hy, primitive hypoblast; bp, spot where the epiblast has not yet grown over the
hypoblast.
the Fallopian tube, where it meets the spermatozoa, impregnation taking
place in the upper third of that tube, and the ovum reaching the uterus
Vol. I.—35
