| MCA | major coronary artery; Maternity Center Association; medical care administration; methylcholanthrene... |
|---|---|
| PA | panic attack; pantothenic acid; paralysis agitans; paranoia; passive aggressive; pathology; patient'... |
| PAD | pain and distress; patient surface axis depth; percutaneous abscess drainage; percutaneous automated... |
| PAH | para-aminohippurate; phenylalanine hydrolase; polycyclic aromatic hydrocarbon; predicted adult heigh... |
| PCA | para-chloramphetamine; parietal cell antibody; passive cutaneous anaphylaxis; patient care assistant... |
| transverse palatine suture | Line of union of the palatine processes of the maxillae with the horizontal plates of the palatine bones. Synonym: sutura palatina transversa. (05 Mar 2000) |
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| transverse part of left branch of portal vein | <anatomy, vein> The long unbranched portion of the left branch of the portal vein. Synonym: pars transversa rami sinistri venae portae hepatis. (05 Mar 2000) |
| transverse part of nasalis muscle | <anatomy> See: nasalis muscle. Synonym: pars transversa musculi nasalis. (05 Mar 2000) |
| transverse perineal ligament | <anatomy> The thickened anterior border of the urogenital diaphragm, formed by the fusion of its two fascial layers. Synonym: ligamentum transversum perinei, Krause's ligament, ligamentum transversum pelvis, transverse ligament of pelvis, transverse ligament of perineum. (05 Mar 2000) |
| transverse plane | A plane across the body at right angles to the coronal and sagittal plane's. Synonym: horizontal plane. (05 Mar 2000) |
| transverse pontine fibres | Fibres arising from the pontine nuclei, decussate and pass into the cerebellum as the middle cerebellar peduncles. Synonym: fibrae pontis transversae. (05 Mar 2000) |
| transverse presentation | An abnormal presentation, neither head nor breech, in which the foetus lies transversely in the uterus across the axis of the parturient canal. (05 Mar 2000) |
| transverse process | A bony protrusion on either side of the arch of a vertebra, from the junction of the lamina and pedicle, which functions as a lever for attached muscles. Synonym: processus transversus. (05 Mar 2000) |
| transverse rectal folds | The three or four crescentic folds placed horizontally in the rectal mucous membrane; the superior rectal fold is situated near the beginning of the rectum on the left side; the middle rectal fold (Nelaton's fold) is most prominent and consistent and projects from the right side about 8 cm above the anus (approximately the level of the floor of the rectouterine or rectovesical pouch); the inferior rectal fold is on the left side about 5 cm above the anus. Synonym: plicae transversales recti, Houston's folds, Houston's valves, Kohlrausch's valves, plicae recti, rectal folds, rectal valves. (05 Mar 2000) |
| transverse relaxation | In nuclear magnetic resonance, the rapid decay of the nuclear magnetization vector at right angles to the magnetic field after the 90 |
| transverse rhombencephalic flexure | The dorsally concave curvature of the rhombencephalon in the embryo; appearance indicates division of rhombencephalon into myelencephalon and metencephalon. Synonym: basicranial flexure, transverse rhombencephalic flexure. (05 Mar 2000) |
| transverse ridge | A crest or ridge on the occlusal surface of a tooth formed by the union of two triangular crests. Synonym: transverse crest, transverse ridge. (05 Mar 2000) |
| transverse section | A cross section obtained by slicing, actually or through imaging techniques, the body or any part of the body structure, in a horizontal plane, i.e., a plane which intersects the longitudinal axis at a right angle. Since actual sectioning in the transverse plane results in an inferior and a superior portion, an anatomical transverse section may be a two-dimensional view of the cut surface on the inferior aspect of the superior portion, or of the superior aspect of the inferior portion. By convention, in medical imaging transverse sections demonstrate the former unless otherwise stated. Synonym: axial section. (05 Mar 2000) |
| transverse septum | The mesodermal mass separating the pericardial and peritoneal cavities; it is covered with mesothelium except where intimately associated with the liver which originally develops within it; the septum is definitively incorporated into the diaphragm as the central tendon. (05 Mar 2000) |
| transverse sinus | A paired dural venous sinus that drains the confluence of sinuses, running along the occipital attachment of the tentorium cerebelli and terminating in the sigmoid sinus. Synonym: sinus transversus, lateral sinus. Transverse pericardial sinus, a passage in the pericardial sac between the origins of the great vessels, i.e., posterior to the intrapericardial portions of the pulmonary trunk and ascending aorta and anterior to the superior vena cava and superior to the atria; it is formed as a result of the flexure of the heart tube, partially approximating the great venous and arterial vessels. Synonym: sinus transversus pericardii, Theile's canal, transverse sinus of pericardium. (05 Mar 2000) |