from The Century Dictionary.
- noun The formation and development of the embryo; that department of science which treats of such formation and development.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Biol.) The production and development of an embryo.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biology The production and development of an
from Wiktionary, Creative Commons Attribution/Share-Alike License
Until recently, practically nothing was known about the morphogenetic processes concealed in this metamorphosis, about what cranial structures take part in it, and about the exact way in which the cetacean skull becomes transformed during embryogeny.
His study of embryogeny impressed on him the frequent occurrence of deviations from the norm in individual development “Errors” arise that produce new characteristics of organisms and are then trans - mitted to offspring.
Mr. Brown, that it was a disadvantage to be able to draw, I always fancy he had Bauer in his mind's eye; for had he been a writer and not a drawer, before 1800, in great probability we should have known nearly as much of embryogeny as we do now.
But he still holds fast to the main thesis of transcendentalism -- the absolute unity of plan of all animals, vertebrate and invertebrate alike,  the gradual perfecting of organisation from monad to man, the repetition in the embryogeny of the higher animals of the "zoogeny" of the lower.
Baer's law that the characters of the large groups appear earlier in embryogeny than the characters of the lesser classificatory divisions.
The primitive Annelid mouth, however, does not appear in the embryogeny of Vertebrates, for the great development of the brain crowds it out of existence.
The number of stages in embryogeny is proportionate to the complexity of the adult; the younger the embryo the simpler its organs -- such is the general formula of the relation between the embryo and the adult.
The hypothesis explains also the way in which the orderly succession of stages in embryogeny is brought about, for we can readily understand that the embryo will not remember any stage until it has passed through the stage immediately preceding it.
Opinions differed considerably as to the primitive mode of origin of the two-layered sac which was very generally admitted to be of constant occurrence in early embryogeny.
Fabrizio of Acquapendente (Fabr. ab Aquapendente, 1537-1619), who worked in the field of embryogeny and studied carefully the valves in the veins, and finally Giulio Casserio (1561-1619), who published a series of anatomical charts.