| 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) |
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| 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) |
| plexus subclavius | The autonomic plexus accompanying the artery of this name, formed by fibres from the stellate ganglion, and giving off secondary plexus's along the branches of the subclavian. Synonym: plexus subclavius, subclavian plexus. (05 Mar 2000) |
| plexus submucosus | A gangliated plexus of unmyelinated nerve fibres, derived chiefly from the superior mesenteric plexus, ramifying in the intestinal submucosa. Synonym: plexus submucosus, Meissner's plexus, Remak's plexus. (05 Mar 2000) |
| plexus subserosus | The subserous part of the enteric plexus of autonomic nerves. Synonym: plexus subserosus. (05 Mar 2000) |
| plexus suprarenalis | An autonomic plexus formed mainly by branches from the coeliac ganglion, lying at the hilus of the suprarenal gland. Synonym: plexus suprarenalis. (05 Mar 2000) |
| plexus temporalis superficialis | An autonomic plexus of nerves on the artery of this name, derived from the external carotid plexus. Synonym: plexus temporalis superficialis. (05 Mar 2000) |
| plexus testicularis | The autonomic plexus derived from the aortic plexus and accompanying the testicular artery. Synonym: plexus testicularis, spermatic plexus. (05 Mar 2000) |
| plexus thyroideus impar | A venous plexus in front of the lower portion of the trachea formed by anastomoses between the inferior laryngeal veins and veins emerging from the caudal border of the thyroid; it terminates in the unpaired inferior thyroid vein. (05 Mar 2000) |
| plexus thyroideus inferior | An autonomic plexus on the artery of this name, derived from the subclavian plexus. Synonym: plexus thyroideus inferior. (05 Mar 2000) |
| plexus thyroideus superior | An autonomic plexus on the artery of the same name, derived from the external carotid plexus. Synonym: plexus thyroideus superior. (05 Mar 2000) |
| plexus tympanicus | A plexus on the promontory of the labyrinthine wall of the tympanic cavity, formed by the tympanic nerve, an anastomotic branch of the facial, and sympathetic branches from the internal carotid plexus; it supplies the mucosa of the middle ear, mastoid cells, and auditory (eustachian) tube, and gives off the lesser superficial petrosal nerve to the otic ganglion. Synonym: plexus tympanicus, Jacobson's plexus. (05 Mar 2000) |
| plexus uretericus | The autonomic plexus derived from the coeliac plexus that accompanies the ureter. Synonym: plexus uretericus. (05 Mar 2000) |
| plexus uterovaginalis | A gangliated autonomic plexus on each side of the cervix of the uterus, derived from the inferior hypogastric plexus. Synonym: plexus uterovaginalis, Frankenhauser's ganglion, Lee's ganglion. (05 Mar 2000) |