| primitive perivisceral cavity | The space between the ectoderm and endoderm in the gastrula. Synonym: primitive perivisceral cavity. (05 Mar 2000) |
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| primitive pit | The depression in the primitive node that serves to connect the notochordal canal with the surface ectoderm and the yolk sac. These connections are referred to as the neurenteric canal. (05 Mar 2000) |
| primitive reticular cell | A cell with processes making contact with those of other similar cell's to form a cellular network; along with the network of reticular fibres, the reticular cell's form the stroma of bone marrow and lymphatic tissues. (05 Mar 2000) |
| primitive ridge | One of the paired ridge's on either side of the primitive groove. (05 Mar 2000) |
| primitive streak | An ectodermal ridge in the midline at the caudal end of the embryonic disk from which arises the intraembryonic mesoderm; achieved by inward and then lateral migration of cells; in human embryos, it appears on day 15 and gives a cephalocaudal axis to the developing embryo. Synonym: germinal streak. (05 Mar 2000) |
| neuroectodermal tumour, primitive | A malignant brain tumour sharing common features and biologic properties with medulloblastoma. Some pathologists and clinicians use the terms interchangeably: they both can disseminate throughout the nervous system and, in some cases, systemically. most lesions arise from the posterior fossa in children under five years of age. The tumour often produces hydrocephalus and symptoms of increased intracranial pressure. Papilledema is often present. (12 Dec 1998) |
| superior fascia of urogenital diaphragm | A layer of fascia that has been described on the superior surface of the sphincter urethrae and the deep transverse perineal muscles. Its presence is doubted by some anatomists. Synonym: fascia diaphragmatis urogenitalis superior. (05 Mar 2000) |
| inferior fascia of urogenital diaphragm | The layer of fascia extending between the ischiopubic rami inferior to the sphincter urethrae and the deep transverse perineal muscles. Synonym: membrana perinei, fascia diaphragmatis urogenitalis inferior, Camper's ligament, ligamentum triangulare, perineal membrane, triangular ligament. (05 Mar 2000) |
| tuberculosis, urogenital | A general term for tuberculosis of the urinary and/or genital systems or urinary organs other than the kidney, which is tuberculosis, renal. (12 Dec 1998) |
| urogenital | <anatomy> Pertaining to the urinary and genital apparatus, genitourinary. (18 Nov 1997) |
| urogenital abnormalities | Congenital structural abnormalities of the urogenital system. (12 Dec 1998) |
| urogenital apparatus | The organs concerned in the production and excretion of urine, together with the organs of reproduction. (12 Dec 1998) |
| urogenital canal | <anatomy, urology> The tube that conveys urine from the bladder to the outside. In the female it measures 25.4 to 38.1 millimetres, in the male 25 centimetres. (27 Sep 1997) |
| urogenital cleft | The cleft between the labia majora. Synonym: rima pudendi, fissura pudendi, pudendal cleavage, pudendal slit, rima vulvae, urogenital cleft, vulvar slit. (05 Mar 2000) |
| urogenital diaphragm | A triangular sheet of muscle between the ischiopubic rami; composed of the sphincter urethrae, and the deep transverse perineal muscles. Synonym: diaphragma urogenitale. (05 Mar 2000) |