PAPAVERIN 



968 



PAPILLITIS 



Papaverin (pap-av'er-in) [papaver, poppy], C 21 H 21 - 

 N0 4 . An alkaloid found in opium. It is narcotic, 

 and produces primarily muscular relaxation, later con- 

 vulsions. Dose gr. }( . Unof. 



Papaverous {pap-av' '-er-us) [papaver, poppy]. Par- 

 taking of the character of the poppy. 



Papaw {pa-paw') [a name of Malabar origin]. I. The 

 seed of Asimina triloba, a prompt emetic. Dose of 

 the fid. ext. TT^x-xxx. Unof. 2. The tree Carica 

 papaya ; also, its edible fruit. See Papain. 



Papayotin [pap-a-yo'-tin). See Papain. 



Paper {pa'-per) [irairvpog, the plant papyrus]. See 

 Charta. P. -shell Lobster. See Buckle-shell. 



Papilionaceous [pap-il-e-on-a' 's/ie-us) [papilis, butter- 

 fly]. Resembling a butterfly. 



Papilla (pap-il' '-ah) [L., a nipple]. In anatomy, any 

 small, soft, conic eminence, as the nipple. The word 

 is used alone to designate the optic disc or nerve-head 

 as seen by the ophthalmoscope. In pathology, a 

 pimple, or pustule. Cf. Mammilla; Wart. P., 

 Caliciform, P., Cir- 

 cumvallate, one of 

 the large papillae 

 at the root of the 

 tongue, arranged like 

 a V opening forward. 

 P., Clavate. Syno- 

 nym of P. , Fungi- 

 form. P., Com- 

 pound, a papilla 

 covered with several 

 perfect secondary 

 papillae. P., Conic. 

 See P. , Filiform. 

 P., Conoidal. Syn- 

 onym of P., Fili- 

 form. P., Dental. 

 See Organ, Enamel. 

 P., Duodenal, the 

 elevation at the 

 point where the 

 ductus choledochus 

 communis enters the 

 duodenum. P. of Eye. See Disc. P., Filiform, 

 any one of the smallest and most numerous of the 

 lingual papillae. They are conic and have project- 

 ing from their apices filiform processes of a whitish tint. 

 P., Foliate, 

 one of the 

 small folds 

 o f mucous 

 membrane 

 at the sides 

 of the tongue 

 near its 

 base, con- 



and are of three varieties, filiform , fungiform, and foli- 

 ate. See Illustrations. P. mammae, the nipple. P., 



Filiform Papilla. X 30. 

 1. Primary papilla. 2. Secondary 

 papillae 011 its summit. 3. Epi- 

 thelial process on papilla. 4. 

 Single process, with entangled 

 epithelial cells. 



taming taste- 

 organs. P., 

 Fungiform, 

 any one of 

 the medium- 

 sized papil- 

 lae of the 

 ton g u e 



Fungiform Papilla. 



X 30. 



They are named from their resemblance to a young 

 mushroom. P., Hair, the projection of the corium 

 into the depression at the end of the hair-bulb. P. of 

 Kidney. See P. , Penal. P. Lacrymal, the small 

 elevation at the inner edge of the eyelid containing the 

 opening into the canaliculus. P., Lingual, one of the 

 elevations of the mucous membrane of the dorsum of 

 the tongue ; they are covered by stratified epithelium, 



Tongue of Rabbit, Showing 

 Foliate Papillae, P. F. (From 

 Stirling.) 



Foliate Papillae in the Rabbit. X 80. 

 1,1*. Primary and secondary septa, g. Taste-huds. n. Meduk 

 lated nerve, d. Serous gland, a. Its duct. M. Muscular 

 fibers. 



Maximal. Same as P., Circumvallate. P., Medul- 

 lary, one of the small eminences on the medulla oblon- 

 gata. P., Minimal. Same as P. , Conic. P., Nerve, 

 any one of the skin-papillae containing tactile corpuscles 

 or nervous plexuses. 

 P. optica, the optic 

 disc or prominence 

 formed by the fibers 

 of the optic nerve 

 after having entered 

 the cavity of the eye- 

 ball. P.', Renal, the 

 summit of any one of 

 the renal pyramids 

 projecting into the 

 renal pelvis. P. of Skin, any one of the minut< 

 finger-like projections of the corium. P. spiralis, the 

 same as Organ of Corti. See Corti, Organ of. P . 

 Tactile, one of the papillae of touch ; little emir 

 of the true skin containing tactile corpuscle 

 nerve-fibers. P. truncatae. Synonym of /'.. I 

 cumvallate. P., Vallate. See P., Circumvallate. 



Papillar {pap-il'-ar). Synonym of Papillary. 



Papillary (pap'-il-a-re) [papilla, nipple]. Pertaining 

 to a papilla. Also, pertaining to the nipple. 1' 

 papillae. P. Wave. See Percussion-wave. 



Papillate [pap'-il-at) [papilla, nipple, bud]. I» 

 botany, covered with papillae. 



Papuliferous {pap-il-if '-er-us) [papilla, papilla; 

 to bear] . Papillate ; bearing one or more fleshy ex 

 crescences. 



Papilliform {pap-il'-iform) [papilla, nipple , 



to form]. Shaped like a papilla, or nipple. P- 

 Bodies of Van Bemmelen. Sec Megalesthete. P- 

 Layer of the Skin, the layer bearing the p. 

 Muscles, those conic columnar carnea. 1 of tin 

 to which the chordae tendinece are attached. 



Papillitis {pap-il-i'-tis) [papilla, papilla ; trig, inflar 

 mation]. Inflammation of the optic disc or papll 

 of the eye. The old terms choked disc, descet 

 neuritis, etc., implied unproved theories of cau- 

 tion, and have been replaced by the adoption 



