| DP | data processing; deep pulse; definitive procedure; degradation product; degree of polymerization; de... |
|---|---|
| MP | macrophage; matrix protein; mean pressure; melphalan and prednisone; melting point; membrane potenti... |
| PIT | pacing-induced tachycardia; patella inhibition test; picture identification test; pitocin; pitressin... |
| pit | pituitary |
| Post | Pit posterior pituitary [gland] |
| PTA | Primitive trigeminal artery |
|---|---|
| PHSC | primitive hematopoietic stem cell |
| PS | primitive streak |
| 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) |
| anal pit | 1. An ectodermally lined depression under the root of the tail, adjacent to the terminal part of the embryonic hindgut; at its bottom, proctodeal ectoderm and cloacal endoderm form the cloacal plate. When this epithelial plate ruptures, the anal and urogenital external orifices are established. Synonym: anal pit. 2. Terminal portion of the insect alimentary canal, extending from the pylorus (area of malpighian tubule attachment) to the anal opening; in certain diptera (flies) and other insects, the proctodeum is divided into a tubular anterior intestine and an enlarged posterior intestine, or rectum, ending at the anus. Origin: L. Fr. G. Proktos, anus + hodaios, on the way, fr. Hodos, a way (05 Mar 2000) |
| articular pit of head of radius | The depression on the top (superior surface) of the head of the radius for articulation with the capitulum of the humerus. Synonym: fovea articularis capitis radii, articular pit of head of radius. (05 Mar 2000) |
| borrow pit | Excavations created by the surface mining of rock, unconsolidated geologic deposits or soil to provide material (borrow) for fill elsewhere. (09 Oct 1997) |
| buccal pit | A structural depression found on the buccal enamel of molars. (05 Mar 2000) |
| gastric pit | One of the numerous small pits in the mucous membrane of the stomach that are the mouths of the gastric glands. Synonym: foveola gastrica. (05 Mar 2000) |
| Mantoux pit | Shallow 2-3 mm depressions of the palms and soles in basal cell nevus syndrome. (05 Mar 2000) |
| central pit | A depression in the centre of the macula retinae containing only cones and lacking blood vessels. Synonym: fovea centralis retinae, central pit. (05 Mar 2000) |
| coated pit | <biology> First stage in the formation of a coated vesicle. (18 Nov 1997) |
| pit | Region of the plant cell wall in which the secondary wall is interrupted, exposing the underlying primary cell wall. One or more plasmodesmata are usually present in the primary wall, communicating with the other half of a pit pair. May be simple or bordered, in the latter case, the secondary wall overarches the pit field. Do not confuse with coated pits. (18 Nov 1997) |
| pit and fissure caries | Caries initiated in the areas where developmental pits and fissures are located on the tooth surface. (05 Mar 2000) |
| pit and fissure sealants | Agents used to occlude dental enamel pits and fissures in the prevention of dental caries. (12 Dec 1998) |