PLEUROTHOTONIC 



1120 



PLEXUS 



Pleurothotonic (plu-ro-tho-ton'-ik) \_TrAevp6dev, from 

 the side; reiveiv, to bend]. Of the nature of or af- 

 fected with pleurothotonos. 



Pleurothotonos (plu-ro-thof -o-nos) [ir?ievp6d£v, from 

 the side ; reiveiv, to bend]. A bending of the body 

 to one side during a tetanic or other convulsion. 



Pleurotomy (plu-rot' -o-me) [n^evpa, pleura ; to/lit/, a 

 cutting]. Incision into the pleura, as in empyema 

 for the evacuation of the purulent collection. The 

 incision is made between two ribs, usually in the 

 eighth intercostal space dorsad of the posterior axillary 

 line. 



Pleurotonus (plu-rot'-o-nus). Synonym of Pleuro- 

 thotonos. 



Pleurotribe (plu'-ro-trib) [ivlevpa, the side ; rpij3eiv, to 

 rub]. In biology, applied to such flowers as have the 

 stamens so arranged that an insect entering will re- 

 ceive the pollen upon its side, as in the pea. Cf., 

 Nototribe, Sternotribe. 



Pleurotyphoid (plu-ro-ti'-foid) [iv'kevpa, pleura ; rlxjxjc, 

 stupor]. Pleuritis due to the presence of the bacillus 

 of typhoid fever. 



Pleurovisceral (plu-ro-viY-er-al) \_Tr?ievpd, pleura, side ; 

 viscus, an organ or viscus]. Pertaining to the pleura 

 or side, and to the viscera. 



Plexal (pleks'-al) [plectere, to knit]. Pertaining to or 

 of the nature of a plexus. 



Plexed (plekst) [plexus, plaited]. Netted; plexiform. 



Plexiform (pleks'-if-orm) [plexus, plexus ; forma, 

 form]. Resembling a plexus. P. Angio-sarcoma, 

 ah angio-sarcoma in which the sarcomatous vessels 

 anastomose, forming a winding network. P. Glands. 

 See Gland. P. Neuroma, a convoluted serpentine 

 enlargement of the peripheral nerves. Generally it is 

 only the connective tissue of the nerves that is in- 

 volved ; these are then fibromatous masses. Rarely, 

 however, the nerves themselves participate, becoming 

 lengthened and increased in number. 



Pleximeter (pleks-im'-et-er) \ji7-.ij^ic, a stroke ; pierpov, 

 measure]. An ivory disc or other hard substance 

 placed on the body to receive the stroke in mediate 

 percussion. Sometimes a pleximeter is used that 

 consists of two flat discs joined at their centers by a 

 short cylinder or rectangular rod. 



Pleximetric (pleks-im-ei'-rik) [nlrji-iQ, a stroke; irer- 

 pov, measure]. Pertaining to or performed with a 

 pleximeter. 



Plexometer (pleks-om'-et-er). Same as Pleximeter. 



Plexor (pleks'-or) [ttatj^ic,, stroke]. The hammer used 

 for striking upon the pleximeter. 



Plexure (plehs'-ur) [pleclere, to interweave]. An in- 

 terweaving ; a plexus. 



Plexus (pleks'-us) \_plectere, to knit]. An aggregation 

 of vessels or nerves forming an intricate network. 

 A table of the nerve-plexuses is appended. P. artic- 

 ularis, a small venous plexus near the outer aspect 

 of the temporo-maxillary articulation. P. cerebri, 

 either of the choroid plexuses. P., Choroid, a fringe- 

 like membrane, occupying the margin of a fold of the 

 pia mater in the interior of the brain. In structure, it 

 consists of minute and highly vascular villous processes, 

 composed of large round corpuscles, containing, be- 

 sides a central nucleus, several yellowish granules and 

 fat-molecules, and covered by a single layer of flat- 

 tened epithelium. P. ciliaris. Synonym of Canal of 

 Schlemm. P. cirsoides. Synonym of P., Pampini- 

 form. P. digitalis, one of the venous plexuses on 

 the anterior and posterior surfaces of the second and 

 third phalanges. P., Fundamental. See P., Princi- 

 pal. P., Ganglionic, a nervous plexus in which 

 ganglion -cells are found. P. gangliosus, one of the 

 small plexuses formed at the junction of the spinal 



nerves and the inferior hypogastric plexus. They 

 contain a number of ganglia. P. glandularis, P. 

 glanduliformis. Synonym of P., Choroid. P., 

 Hemorrhoidal, a plexus of veins surrounding the 

 lower part of the rectum, beneath the mucous mem- 

 brane, and giving origin to the inferior, middle, and 

 superior hemorrhoidal veins. P., Hovius', a plexus 

 of veins in the ciliary region of the eye. P., Inter- 

 laminar, a lymphatic plexus formed by the lymphatic 

 vessels in the muscular coat of the intestines. P., 

 Lymphatic, a plexus of lymphatic vessels. P. 

 Malleal, P., Manubrial, a plexus of veins surround- 

 ing the handle of the malleus. P., Medulli-spinal, 

 a venous plexus surrounding the spinal cord. P., 

 mirabilis. Synonym of P., Choroid. P. nervorum 

 spinalium, a plexus formed by the spinal nerves, 

 e. g., the cervical, brachial, lumbar, or sacral. P., 

 Pampiniform, the spermatic plexus, collecting the 

 blood from the testicle, and emptying by a single vein, : 

 the spermatic, into the right renal vein on the right side, 

 and into the inferior cava on the left. In the female , the 

 plexus collects the blood from the uterus, the oviduct, 

 and the ovary. P., Parotid. Synonym of Pes anseri- 

 nus. P., Perineal, a superficial and a deep venous 

 plexus are found in the perineum. The superficia 

 formed by veins from the labia majora and some from 

 the prepuce of the clitoris and the bulbs. Its blood 

 is carried to the superficial epigastric, pudic and ex- 

 ternal obturator veins. The deep plexus is formed by 

 the veins from the cavernous bodies, from the bulbs, 

 and a branch from the dorsal vein of the clitoris. P., 

 Pharyngeal, a venous plexus surrounding the 

 pharynx. P. plantaris, a plexus of veins on the sole 

 of the foot. P., Principal or Fundamental, a plexus 

 formed by the larger nerves of the body. They fre- 

 quently contain ganglionic cells which are collected 

 into microscopic ganglia. P., Prostatic : (i) A plexus 

 of veins surrounding the prostate gland ; it receives the 

 dorsal veins of the penis. (2) See also P. , Prostatic, in 



Table. P., Pterygoid, a plexus of veins formed by 

 branches of the internal maxillary vein, and situated 

 between the temporal and external pterygoid muscles. 

 P., Pudendal, a venous plexus into which veins from 

 the clitoris, the labia minora, the urethra, and the 

 vaginal vestibule empty. The corresponding plexus 

 in the male surrounds the prostate and membranous 

 urethra. P., Santorini's, the prostatic plexus of 

 veins. P. seminalis. Synonym of Pete testis. P. 

 spinalis, the plexus formed by the spinal veins. 

 There are two, an anterior and a posterior spinal 

 plexus. P., Sympathetic, a plexus formed by sym- 

 pathetic nerve-fibers. P. thyroideus impar, n venous 

 plexus situated beneath the isthmus of the thyroid 

 gland. It is derived from the inferior thyroid veins 

 P. tonsillaris: (1) a venous plexus surrounding the 

 tonsil; (2) See also/ 1 ., Tonsillar, in Table. P., Ureth- 

 ro-vesical, a venous plexus situated about the urethra 

 and the lower portion of the bladder. It receive^ the 

 dorsal vein of the clitoris, the pudic veins (right and 

 left), veins from the cavernous bodies of the dinni-. • 

 branch from the obturator vein, and a few small 

 branches from the urethra and the neck of the bladder. 

 P., Utero-vaginal, a venous plexus surrounding the 

 vagina, the neck and the body of the uterus. P.. 

 Vaginal : (i) a venous plexus surrounding the vagina ; 

 (2) See also P., Vaginal, in Table. P., Venous, 

 a network or plexus of veins. P., Vesical : (1) a 

 plexus of veins in the wall of the bladder, outside ol 

 the muscular coat ; it communicates with the heme* 

 rhoidal and prostatic plexuses in the male, and with 

 the vaginal plexuses in the female; (2) See also P., 



Vesical, in Table. 



