| 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) |
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| ectodermal | Relating to the ectoderm. Synonym: ectodermic. (05 Mar 2000) |
| ectodermal cloaca | The proctodeum of the embryo. (05 Mar 2000) |
| ectodermal dysplasia | A hereditary condition (most often x linked) that is characterised by the abnormal development of skin, absence of sweat glands, dry eyes and abnormal development of teeth. Symptoms include absent teeth, peg teeth, inability to sweat, thin skin and heat intolerance. Mucous membrane involvement may result in a foul-smelling nasal discharge. The inability to sweat leads to the inability to maintain normal body temperature in a warm environment. Some may exhibit fevers and will require artificial cooling. Origin: Gr. Plassein = to form (27 Sep 1997) |
| ectodermatosis | A disorder of any organ or tissue developed from the ectoderm. Synonym: ectodermatosis. (05 Mar 2000) |
| ectodermic | <biology> Of or relating to the ectoderm. Source: Websters Dictionary (01 Mar 1998) |
| ectodermosis | A disorder of any organ or tissue developed from the ectoderm. Synonym: ectodermatosis. (05 Mar 2000) |
| ectodermosis erosiva pluriorificialis | <syndrome> This is a severe form of allergic reaction that most often results from a medication (for example penicillins). The rash can be generalised and even appear on the palms of the hands and soles of the feet. Stevens-Johnson syndrome is considered to be a variant of erythema multiforme that results in the formation of bullous (blebs) lesions on the soles of the feet, palms and inside the mouth. Stevens-Johnson syndrome may also occur in association with some viral infections and Mycoplasma infections. (27 Sep 1997) |
| amniotic ectoderm | Inner layer of the amnion continuous with body ectoderm. (05 Mar 2000) |
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| 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) |
| 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) |