germ epithelium

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• Epithelium — This article is about the epithelium as it relates to animal anatomy. For the fungal structure of the same name, see Pileipellis. Epithelium Code TH H2.00.02.0.00001 Epithelium is one of the four basic types of animal tissue, along with… …   Wikipedia

• Epithelium — The outside layer of cells that covers all the free, open surfaces of the body including the skin, and mucous membranes that communicate with the outside of the body. By contrast the endothelium is the layer of cells lining the closed internal… …   Medical dictionary

• Germ layer — [ http://www.ncbi.nih.gov/About/primer/genetics cell.html NCBI] .] A germ layer is a collection of cells, formed during animal embryogenesis. Germ layers are particularly pronounced in the vertebrates; however, all animals more complex than… …   Wikipedia

• germ cell — A member of a cell lineage (the germ line) leading to the production of gametes. In mammals, germ cells are found in the germinal epithelium of the ovaries and testes. Synonym: germ line cell Opposite: somatic cell …   Glossary of Biotechnology

• Derivatives of primary germ layers — ▪ Table Derivatives of primary germ layers Ectoderm epidermis cutaneous derivatives epithelium of:     mouth; oral glands     nasal passages     sense passages central nervous system peripheral nervous system hypophysis; suprarenal medulla… …   Universalium

• germinal epithelium — n the epithelial covering of the genital ridges and of the gonads derived from them * * * the epithelial covering of the ovary, which was formerly thought to be the site of formation of oogonium. It is now thought that the oogonia persist in a… …   Medical dictionary

• trichoblastoma — tricho·blas·to·ma (trik″o blas toґmə) any of a large group of benign adnexal tumors that differentiate toward hair germ epithelium. Cf. trichoepithelioma …   Medical dictionary

• human 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… …   Universalium

• Tooth development — Radiograph of lower right (from left to right) third, second, and first molars in different stages of development. Tooth development or odontogenesis is the complex process by which teeth form from embryonic cells, grow, and erupt into the mouth …   Wikipedia

• animal 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 …   Universalium

• reproductive 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… …   Universalium