| amniotic ectoderm | Inner layer of the amnion continuous with body ectoderm. (05 Mar 2000) |
|---|---|
| blastodermic ectoderm | External layer of the blastula. (05 Mar 2000) |
| chorionic ectoderm | <embryology> Extra embryonic layer of epithelium that forms around the mammalian blastocyst and attaches the embryo to the uterus wall. Forms the outer layer of the chorion and together with maternal tissue will form the placenta. (18 Nov 1997) |
| superficial ectoderm | That part of the ectoderm separating from the neuroectoderm at about the fourth week of embryonic life; the epidermis and its specialised derivatives develop from it. Synonym: superficial ectoderm. (05 Mar 2000) |
| ectoderm | The outer of the three germ layers of the embryo (the other two being mesoderm and endoderm). Ectoderm gives rise to epidermis and neural tissue. (18 Nov 1997) |
| epithelial ectoderm | That part of the ectoderm separating from the neuroectoderm at about the fourth week of embryonic life; the epidermis and its specialised derivatives develop from it. Synonym: superficial ectoderm. (05 Mar 2000) |
| extraembryonic ectoderm | Derivative of epiblast outside the embryo's body. (05 Mar 2000) |
| growth and embryonic development | Developmental processes from cell division to embryogenesis to postnatal growth and maturity. (12 Dec 1998) |
| primary embryonic cell | In a very young embryo, a cell still capable of differentiation. (05 Mar 2000) |
| embryonic | Undeveloped, related to the embryo. (16 Dec 1997) |
| embryonic axis | The cephalocaudal axis established in the embryo by the primitive streak. (05 Mar 2000) |
| embryonic blastoderm | That part of the blastoderm that takes part in the formation of the embryonic body. (05 Mar 2000) |
| embryonic cataract | A congenital cataract situated near the anterior Y suture of the foetal lens nucleus. (05 Mar 2000) |
| embryonic cell | One of the cells produced as the result of cell division, cleavage, in the fertilized egg. (18 Nov 1997) |
| embryonic circulation | The basic plan of the circulation of a young mammalian embryo, at first similar to that in aquatic forms, with an unpartitioned heart and conspicuous aortic arches in the branchial region; as gestation progresses, the arrangement of the major blood vessels gradually approaches that of an adult, but the routing of blood through the heart, characteristic of an adult, cannot be attained until lung breathing begins at birth. (05 Mar 2000) |