| PAL | pathology laboratory; peptidyl-alpha-hydroxyglycine alpha-amidating lysine phase alteration plane; p... |
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| PAR | participating provider; passive avoidance reaction; perennial allergic rhinitis; photosynthetically ... |
| PAS | para aminosalicylate; Parent Attitude Scale; patient administration system; patient appointments and... |
| PAV | percutaneous aortic valvuloplasty; poikiloderma atrophicans vasculare; posterior arch vein; proporti... |
| PBW | posterior bite wing |
| posterior intercostal veins | Veins draining the intercostal spaces posteriorly; those of the first 1-C space drain into the brachiocephalic veins; from spaces 2-3 they drain into right and left superior intercostal veins; from the fourth to the eleventh spaces on the right they are tributaries of the azygos vein; on the left they empty into either the hemiazygos or accessory hemiazygos veins. Synonym: venae intercostales posteriores. (05 Mar 2000) |
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| posterior intermediate groove | A longitudinal furrow between the posterior median and the posterolateral sulci of the spinal cord in the cervical region, marking the gracile fasciculus from the cuneate fasciculus. Synonym: sulcus intermedius posterior, posterior intermediate groove. (05 Mar 2000) |
| posterior intermediate sulcus | A longitudinal furrow between the posterior median and the posterolateral sulci of the spinal cord in the cervical region, marking the gracile fasciculus from the cuneate fasciculus. Synonym: sulcus intermedius posterior, posterior intermediate groove. (05 Mar 2000) |
| posterior interosseous artery | <anatomy, artery> Origin, common interosseous artery; distribution, posterior compartment of forearm. Synonym: arteria interossea posterior, dorsal interosseous artery. (05 Mar 2000) |
| posterior interosseous nerve | <anatomy, nerve> The deep terminal branch of the radial nerve, arises in the cubital region, penetrating and supplying the supinator and continuing with the posterior interosseous artery to supply all the extensor muscles in the forearm. Synonym: nervus interosseus posterior, nervus antebrachii posterior, deep branch of the radial nerve, dorsal interosseous nerve, nervus interosseus dorsalis, posterior antebrachial nerve. (05 Mar 2000) |
| posterior interventricular artery | <anatomy, artery> Posterior interventricular branch of right coronary artery. Continuation of right coronary artery in posterior interventricular sulcus; descends to apex to anastomose with anterior interventricular artery; supplies most of diaphragmatic aspect of ventricles and posterior third of interventricular septum. Synonym: ramus interventricularis posterior arteriae coronariae dextrae, posterior descending artery. (05 Mar 2000) |
| posterior interventricular groove | A groove on the diaphragmatic surface of the heart, marking the location of the septum between the two ventricles. Synonym: sulcus interventricularis posterior, crena cordis. (05 Mar 2000) |
| posterior intestinal portal | In young embryos, the communications from the midgut to the hindgut. (05 Mar 2000) |
| posterior intraoccipital joint | Cartilaginous union between the squamous and lateral parts of the occipital bone in the newborn. Synonym: synchondrosis intraoccipitalis posterior, Budin's obstetrical joint, posterior intraoccipital joint. (05 Mar 2000) |
| posterior intraoccipital synchondrosis | Cartilaginous union between the squamous and lateral parts of the occipital bone in the newborn. Synonym: synchondrosis intraoccipitalis posterior, Budin's obstetrical joint, posterior intraoccipital joint. (05 Mar 2000) |
| posterior junction line | Radiographic image of the mediastinal septum between the upper lobes behind the oesophagus, above the aortic arch. (05 Mar 2000) |
| posterior knee region | The posterior region of the knee, including the popliteal fossa. Synonym: regio genus posterior. (05 Mar 2000) |
| posterior labial arteries | The posterior labial branches, branches of the perineal artery to the labium majus. Synonym: rami labiales posteriores arteriae pudendae internae. (05 Mar 2000) |
| posterior labial commissure | A slight fold uniting the labia majora posteriorly in front of the anus. Synonym: commissura labiorum posterior. (05 Mar 2000) |
| posterior labial nerves | Terminal branches of the superficial perineal nerve, supplying the skin of the posterior portion of the labia and the vestibule of the vagina, corresponding to the posterior scrotal nerves in the male. Synonym: nervi labiales posteriores. (05 Mar 2000) |