| PNET | peripheral neuroepithelioma; primitive neuroectodermal tumor |
|---|---|
| IB | idiopathic blepharospasm; immune body; inclusion body; index of body build; infectious bronchitis; I... |
| LB | lamellar body; large bowel; left breast; left bronchus; left bundle; left buttock; leiomyoblastoma; ... |
| TBS | total body solids; total body solute; total body surface; total burn size; Townes-Brocks syndrome; t... |
| JP drain | The original suction drain. The drain itself is inside the body. It is made of Teflon and has multip... |
| primitive palate | In the early embryo, the mesoderm-filled shelf, formed from the medial nasal process, that anteriorly separates the oral cavity below from the primitive nasal cavities above. Synonym: primitive palate. (05 Mar 2000) |
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| primitive perivisceral cavity | The space between the ectoderm and endoderm in the gastrula. Synonym: primitive perivisceral cavity. (05 Mar 2000) |
| 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) |
| perineal | <anatomy> Pertaining to the perineum. (18 Nov 1997) |
| perineal artery | <anatomy, artery> Origin, internal pudendal; distribution, superficial structures of the perineum; anastomoses, external pudendal arteries. Synonym: arteria perinealis. (05 Mar 2000) |
| perineal branches of posterior femoral cutaneous nerve | <anatomy, nerve> Branches of posterior femoral cutaneous nerve which convey sensory fibres to the skin of the lateral-most perineum and adjacent portions of the upper medial thigh. Synonym: rami perineales nervi cutanei femoris posterioris. (05 Mar 2000) |
| perineal flexure of rectum | The anteroposterior curve with convexity anteriorward of the last portion of the rectum. Synonym: flexura perinealis recti, anorectal angle, anorectal flexure. (05 Mar 2000) |
| perineal hernia | A hernia protruding through the pelvic diaphragm. Synonym: levator hernia, pudendal hernia. (05 Mar 2000) |
| perineal hypospadias | Hypospadias in which the urethral defect continues along the perineum to near the anus; the scrotum is usually cleft, the testes undescended, and the penis rudimentary. (05 Mar 2000) |
| perineal lithotomy | Lithotomy in which the bladder is approached by an incision in the perineum. (05 Mar 2000) |
| perineal membrane | 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) |