| PASVR | pulmonary anomalous superior venous return |
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| Pv | Proteus vulgaris; venous pressure |
| PVA | Paralyzed Veterans of America; peripheral venous alimentation; polyvinyl acetate; polyvinyl alcohol;... |
| PVCO2 | partial pressure of carbon dioxide in mixed venous blood |
| PVF | peripheral visual field; portal venous flow; primary ventricular fibrillation |
| posterior cord of brachial plexus | In the brachial plexus, the bundle of nerve fibres formed by the posterior divisions of the upper, middle and lower trunks which lies posterior to the axillary artery; it gives rise to the upper and lower subscapular and thoracodorsal nerves, terminates by dividing into the axillary, and radial nerves. Synonym: fasciculus posterior plexus brachialis. (05 Mar 2000) |
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| posterior coronary plexus | The portion of the cardiac plexus that accompanies branches of the coronary arteries on the posteroinferior surface of the heart. (05 Mar 2000) |
| Cruveilhier's plexus | A nerve plexus formed by communications between the dorsal primary rami of the first three cervical nerves; it lies deep to the semispinalis capitis muscle. (05 Mar 2000) |
| haemorrhoidal plexus | A venous plexus resting upon the posterior and lateral walls of the rectum; it drains into the superior rectal vein to the portal, the middle rectal to the internal iliac and the inferior rectal to the internal pudendal. Synonym: plexus venosus rectalis, haemorrhoidal plexus. (05 Mar 2000) |
| Haller's plexus | A nervous plexus of sympathetic filaments and branches of the external laryngeal nerve on the surface of the inferior constrictor muscle of the pharynx. (05 Mar 2000) |
| sacral plexus | 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) |
| Heller's plexus | Plexus of small arteries in the wall of the intestine. (05 Mar 2000) |
| Santorini's plexus | Venous plexus on ventral and lateral prostatic surfaces. (05 Mar 2000) |
| Sappey's plexus | A network of lymphatics in the areola of the nipple. (05 Mar 2000) |
| hepatic plexus | An unpaired autonomic plexus lying on the hepatc artery and its branches in the liver. Synonym: plexus hepaticus. (05 Mar 2000) |
| prostaticovesical plexus | 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) |
| sciatic plexus | 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) |
| pterygoid plexus | 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) |
| pulmonary plexus | 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) |
| hypogastric plexus | A complex network of nerve fibres in the pelvic region. The hypogastric plexus distributes sympathetic fibres from the lumbar paravertebral ganglia and the aortic plexus, parasympathetic fibres from the pelvic nerve, and visceral afferents. The bilateral pelvic plexus is in its lateral extent. (12 Dec 1998) |