| PD | Doctor of Pharmacy; Dublin Pharmacopoeia; interpupillary distance; Paget disease; pancreatic duct; p... |
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| PICA | percutaneous transluminal coronary angioplasty; Porch Index of Communicative Abilities; posterior in... |
| PP | diphosphate group; emphysema [pink puffers]; near point of accommodation [Lat. punctum proximum]; pa... |
| PPA | palpation, percussion, auscultation; pepsin A; phenylpropanolamine; phenylpyruvic acid; Pittsburgh p... |
| Sp | the most posterior point on the posterior contour of the sella turcica; species; specific; specimen;... |
| muscle epithelium | Spindle-shaped, contractile, smooth muscle-like cells of epithelial origin that are arranged longitudinally or obliquely around sweat glands and the secretory alveoli of the mammary gland; stellate myoepithelial cells occur around lacrimal and some salivary gland secretory units. Synonym: muscle epithelium. Origin: myo-+ epithelium (05 Mar 2000) |
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| crevicular epithelium | The stratified squamous epithelium lining the inner aspect of the soft tissue wall of the gingival sulcus. Synonym: sulcular epithelium. (05 Mar 2000) |
| cuboidal epithelium | Simple epithelium with cells appearing as cubes in a vertical section but as polyhedra in surface view. (05 Mar 2000) |
| cylindrical epithelium | Epithelium formed of a single layer of prismatic cells taller than they are wide. Synonym: cylindrical epithelium. (05 Mar 2000) |
| pseudostratified epithelium | An epithelium that gives a superficial appearance of being stratified because the cell nuclei are at different levels, but in which all cells reach the basement membrane, hence it is classed as a simple epithelium. (05 Mar 2000) |
| seminiferous epithelium | Specialised epithelium lining the seminiferous tubules containing developing and mature spermatozoa and sertoli cells. (12 Dec 1998) |
| simple epithelium | An epithelium having one layer of cells. (05 Mar 2000) |
| simple squamous epithelium | Epithelium composed of a single layer of flattened scalelike cells, such as mesothelium, endothelium, and that in the pulmonary alveoli. Synonym: pavement epithelium. (05 Mar 2000) |
| squamous epithelium | <pathology> An epithelium in which the cells are flattened. May be simple (e.g. Endothelium) or stratified (e.g. Epidermis). (18 Nov 1997) |
| stratified ciliated columnar epithelium | An epithelium consisting of several layers of cells with the deeper cells being polyhedral in form and the surface ones columnar with motile cilia, such as that which lines the foetal oesophagus. (05 Mar 2000) |
| stratified epithelium | <pathology> An epithelium composed of multiple layers of cells, only the basal layer being in contact with the basal lamina. The basal layer is of stem cells that divide to produce the cells of the upper layers, in skin, these become heavily keratinised before dying and being shed as squames. Stratified epithelia usually have a mechanical or protective role. (18 Nov 1997) |
| stratified squamous epithelium | An epithelium consisting of several layers of keratin containing cells in which the surface cells are flattened and scale-like and the deeper cells are polyhedral in form. Keratin filaments become progressively more abundant toward the surface, which on the dry surfaces of the body may consist of a layer of dead corneocytes. (05 Mar 2000) |
| sulcular epithelium | The stratified squamous epithelium lining the inner aspect of the soft tissue wall of the gingival sulcus. Synonym: sulcular epithelium. (05 Mar 2000) |
| surface epithelium | A layer of celomic epithelial cells covering the gonadal ridges as they are formed on the medial border of the mesonephroi near the root of the mesentery, the mesothelial covering of the definitive ovary. (05 Mar 2000) |
| inner dental epithelium | Inner enamel epithelium, the columnar epithelial layer of enamel matrix, secreting ameloblasts, of the odontogenic organ of a developing tooth. (05 Mar 2000) |