Term
|
Definition
| The mitotic divisions of the early embryo that occur in the absence of growth to divide the embryo in to many smaller nucleated cells |
|
|
Term
|
Definition
| One of the cells produced as the result of cell division, cleavage, in the fertilized egg |
|
|
Term
|
Definition
| The ball of cells which forms at about 3 – 4 days after insemination of the egg, resulting from the cleavage of the fertilised ovum |
|
|
Term
|
Definition
| an embryo at the stage of development in which it consists of usually one layer of cells around a central cavity, forming a hollow sphere |
|
|
Term
| Type of division when egg has only a little yolk |
|
Definition
| incomplete but equal cleavage |
|
|
Term
| Type of division with moderate amount of yolk |
|
Definition
| Complete cleavage, unequal |
|
|
Term
| Cleavage in mammals that lay eggs |
|
Definition
| incomplete cleavage (also called discoidal) |
|
|
Term
|
Definition
| the fluid-filled cavity inside a blastula |
|
|
Term
|
Definition
| Holds the maternal messages. Tells the cells what to do. |
|
|
Term
|
Definition
| a sphere of cells with an outer cell layer that forms the placenta and a cluster of cells on the interior called the inner cell mass that forms the embryo. |
|
|
Term
|
Definition
| a group of cells found inside a blastocyst and from which embryonic stem cells are derived |
|
|
Term
|
Definition
| These are the cells of the embryo that become the placenta and attach the baby to the mother's uterus |
|
|
Term
|
Definition
| The process of movements and infoldings of embryonic cells destined to become endoderm in early animal embryos, immediately following blastula (or blastoderm) stage, generating the blastopore. |
|
|
Term
|
Definition
| ectoderm, endoderm, mesoderm |
|
|
Term
|
Definition
| central cavity of the gastrula; becomes the intestinal or digestive cavity |
|
|
Term
|
Definition
| the opening into the archenteron |
|
|
Term
|
Definition
| Large food-laden endothermal cells surrounded by the blastopore of an amphibian gastrula. |
|
|
Term
|
Definition
| the notochord develops into part of the backbone. |
|
|
Term
|
Definition
| A structure in early fetal life that develops into the brain, spinal cord, spinal nerves and spinal column. |
|
|
Term
|
Definition
| Paired blocks of mesoderm cells along the vertebrate body axis that form during early vertebrate development and differentiate into dermal skin, bone and muscle. |
|
|
Term
|
Definition
| the closed sac between the embryo and the amnion, containing the amniotic fluid. |
|
|
Term
|
Definition
| the space between the embryonic disc and the yolk of the developing ovum of some animals. |
|
|
Term
|
Definition
| A membranous sac that encloses the embryo or fetus |
|
|
Term
|
Definition
| The outer membrane enclosing the embryo |
|
|
Term
| How many extraembriotic membranes are there? |
|
Definition
|
|
