yolk cell
21cardinal vein — a bilaterally paired longitudinal vein. The anterior cardinal vein returns blood from the head and the posterior cardinal vein from the trunk, joining together as the common cardinal vein (which is also called the duct of Cuvier or incorrectly… …
22Kupffer's vesicle — a small ventro caudal epithelial pocket formed mid ventrally posterior the the yolk cell or its extension as the blastopore narrows in embryonic fish …
23vegetal pole — opposite to the animal pole on the egg. Later in embryonic development corresponds to the point on the yolk cell furthest from the developing blastodisc …
24hypoblast — Cell layer adjacent to the yolk sac cavity and subjacent to the epiblast of a bilayered embryo. [hypo + G. blastos, germ] * * * hy·po·blast hī pə .blast n the endoderm of an embryo called also …
25animal development — Introduction the processes that lead eventually to the formation of a new animal starting from cells derived from one or more parent individuals. Development thus occurs following the process by which a new generation of organisms is produced by …
26human embryology — ▪ biology Introduction the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth. The human body, like that of most animals, develops from a single cell produced by the union of… …
27reproductive system, animal — Introduction any of the organ systems by which animals reproduce. The role of reproduction is to provide for the continued existence of a species; it is the process by which living organisms duplicate themselves. Animals compete with… …
28Cleavage (embryo) — In embryology, cleavage is the division of cells in the early embryo. The zygotes of many species undergo rapid cell cycles with no significant growth, producing a cluster of cells the same size as the original zygote. The different cells derived …
29Egg (food) — Chicken egg redirects here. For the causality dilemma, see Chicken or the egg. On the left a chicken egg, the egg most commonly e …
30Egg (biology) — Bird eggs and others (click on image for key) …
