| 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 |
| PCD | pacer-cardioverter-defibrillator; papillary collecting duct; paraneoplastic cerebellar degeneration;... |
| plexus pharyngeus | The plexus of nerves including branches of the glossopharyngeal, vagus, and accessory nerves (cranial root), that lies along the posterior wall of the pharynx, a venous plexus on the posteriolateral walls of the pharynx, emptying through the pharyngeal veins into the internal jugular. Synonym: plexus pharyngeus. (05 Mar 2000) |
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| plexus pharyngeus ascendens | An autonomic plexus on the artery of the same name, formed of fibres from the superior cervical ganglion. Synonym: plexus pharyngeus ascendens. (05 Mar 2000) |
| plexus prostaticovesicalis | A venous plexus which includes the prostatic venous plexus around the prostate gland and that of the neck of the bladder; it communicates with the vesical and pudendal plexus's, receives the deep dorsal vein of the penis, and empties. By one or more efferent vessels into the internal iliac (hypogastric) vein; it corresponds to the inferior vesical plexus in the female. Synonym: plexus prostaticovesicalis. (05 Mar 2000) |
| plexus prostaticus | An autonomic plexus of nerves intimately associated with the capsule of the prostate, derived from the inferior hypogastric plexus, and giving rise to the cavernous nerves to the erectile tissue of the penis; surgical injury of this plexus ofter results in impotency. Synonym: plexus prostaticus. (05 Mar 2000) |
| plexus pterygoideus | A venous plexus occupying the infratemporal fossa receiving veins accompanying the branches of the maxillary artery, and terminating posteriorly in the maxillary vein; anteriorly the pterygoid plexus drains via the deep facial vein into the facial vein. Synonym: plexus pterygoideus. (05 Mar 2000) |
| plexus pudendalis | A venous plexus, arising chiefly from the dorsal vein of the penis, situated below the base of the bladder at the sides of the prostate. See: prostaticovesical plexus. Synonym: plexus venosus prostaticus, plexus pudendalis, Santorini's labyrinth. (05 Mar 2000) |
| plexus pudendus nervosus | <anatomy, nerve> Formed by fibres from the ventral primary rami of the second, third, and fourth sacral spinal nerves; it exits the pelvis via the greater sciatic foramen, passes posterior to the sacrospinous ligament, and accompanies the internal pudendal artery, into the perineum via the lesser sciatic foramen; it gives off inferior rectal nerves, then courses through the pudendal canal in the lateral wall of the ischiorectal fossa, terminating as the dorsal nerve of the penis or of the clitoris. Synonym: nervus pudendus, plexus pudendus nervosus, pudic nerve. (05 Mar 2000) |
| plexus pulmonalis | One of two autonomic plexus's, anterior and posterior, at the hilus of each lung, formed by cardiopulmonary splanchnic nerves of the sympathetic trunk and bronchial branches of the vagus nerve; from them various branches accompany the bronchi and arteries into the lung. Synonym: plexus pulmonalis. (05 Mar 2000) |
| plexus rectales inferiores | The autonomic plexus's along the anus derived from the inferior hypogastric plexus. Synonym: plexus rectales inferiores, inferior haemorrhoidal plexuses. (05 Mar 2000) |
| plexus rectales medii | The autonomic plexus's along the rectum derived from the inferior hypogastric plexus. Synonym: plexus rectales medii, middle haemorrhoidal plexuses. (05 Mar 2000) |
| plexus rectalis superior | The autonomic plexus derived as a continuation of the inferior mesenteric plexus that accompanies the superior rectal artery. Synonym: plexus rectalis superior, superior haemorrhoidal plexus. (05 Mar 2000) |
| plexus renalis | The autonomic plexus surrounding the renal artery and extending with it into the substance of the kidney. Synonym: plexus renalis. (05 Mar 2000) |
| plexus sacralis | Formed by the fourth and fifth lumbar (lumbosacral trunk) and first, second, and third sacral nerves; it lies on the inner surface of the posterior wall of the pelvis usually embedded in the piriformis muscle; its nerves supply the lower limbs, its major product being the sciatic nerve. Synonym: plexus sacralis, ischiadic plexus, sciatic plexus. (05 Mar 2000) |
| plexus sacralis medius | A lymphatic plexus formed of lymph nodes and connecting vessels situated chiefly in the mesorectum anterior and inferior to the sacral promontory. Synonym: plexus sacralis medius. (05 Mar 2000) |
| plexus splenicus | The plexus of autonomic nerves along the splenic artery. Synonym: plexus lienalis, plexus splenicus. (05 Mar 2000) |