genital primordium

genital primordium
In embryology, the originating cells leading to the development of the reproductive system.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • genital tubercle — n a conical protuberance on the belly wall of an embryo between the attachment of the umbilical cord and the tail that develops into the penis in the male and the clitoris in the female * * * an eminence ventral to the cloaca in the early embryo …   Medical dictionary

  • primordium — An aggregation of cells in the embryo indicating the first trace of an organ or structure. SYN: anlage (1). [L. origin, fr. primus, first, + ordior, to begin] genital p. ovoid clump of cells seen in the rhabditiform larvae of Strongyloides …   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

  • ridge — 1. A (usually rough) linear elevation. SEE ALSO: crest. 2. In dentistry, any linear elevation on the surface of a tooth. 3. The remainder of the alveolar process and its soft …   Medical dictionary

  • Tubercle — A small tuber, a small lump or bump. * * * 1. A nodule, especially in an anatomic, not pathologic, sense. 2. A circumscribed, rounded, solid elevation on the skin, mucous membrane, or surface of an organ. 3. A slight …   Medical dictionary

  • duct — A tubular structure giving exit to the secretion of a gland or organ, capable of conducting fluid. SEE ALSO: canal. SYN: ductus [TA]. [L. duco, pp. ductus, to lead] aberrant ducts SYN: aberrant ductules, under ductule …   Medical dictionary

  • Cord — Short and informal reference to the spinal cord, the major column of nerve tissue that is connected to the brain, lies within the vertebral canal, and from which the spinal nerves emerge. The spinal cord and the brain constitute the central… …   Medical dictionary

  • phallus — SYN: penis. [L.; G. phallos] * * * phal·lus fal əs n, pl phal·li fal .ī, .ē or phal·lus·es 1) PENIS 2) the first embryonic rudiment of the vertebrate penis or clitoris * * * n. the embryonic penis, before the urethral duct has reached its …   Medical dictionary

  • gonadal ridge — an elevation of thickened mesothelium and underlying mesenchyme on the ventromedial border of the embryonic mesonephros; the primordial germ cells become embedded in it, establishing it as the primordium of the ovary or testis. Called also… …   Medical dictionary

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