RINGED 



1274 



RIZIFORM 



laminae of the cornea, sometimes following perforating 

 septic wounds of the cornea. R., Inguinal. See R. , 

 Abdominal. R., Lowe's, a bright violet ring seen 

 on looking through a solution of chromic chlorid. R., 

 Marsh's. See R., Arsenical. R., Maxwell's, a 

 faintly defined halo around the fovea when the eye 

 rests on a homogeneous blue surface. R., Miiller's, a 

 muscular ring observed in an advanced stage of gesta- 

 tion, situated where the canal of the cervix joins the 

 cavity of the body of the uterus. R. -muscle of 

 Muller. See Muscles, Table of. R., Omphalic. 

 See R., Umbilical. R. -scotoma. See Scotoma. R., 

 Spermatorrhea, a metallic ring furnished with sharp 

 points, to be worn during sleep to prevent seminal 

 emissions. R., Tracheal, a tracheal cartilage. R., 

 Tympanic, an osseous ring forming part of the tem- 

 poral bone at the time of birth, and which de- 

 velops into the tympanic plate. R., Umbilical, the 

 ray-like aperture of the abdominal wall by which the 

 umbilical' cord communicates with the fetal system, 

 and through which, in extra-uterine life, the urachus 

 and the remains of the umbilical vessels pass to the 

 umbilicus. R.-worm, a general term for vegetable 

 parasitic diseases of the skin characterized by circinate 

 lesions. R.-worm of the Beard, sycosis parasitica. 

 R.-worm of the Body, tinea circinata. R.-worm, 

 Burmese, a cutaneous affection occurring in Burmah, 

 resembling, and probably identical with, the form 

 of tinea circinata called eczema marginatum. R.- 

 worm, Chinese, ringworm due to Tinea imbri- 

 cata. R.-worm, Honeycomb, favus. R.-worm of 

 the scalp, tinea tonsurans. R.-worm of the Thighs 

 and Genitalia, eczema marginatum. R.-worm, 

 Tokelan, ring-worm due to Tinea imbricata. 



Ringed (ringd) [ME. , ring, ring]. In biology, marked 

 with rings. R. Hair, a very rare form of canities, 

 in which the hairs are white or colored in rings or 

 bands. 



Ringent (rin'-jent) \ringi, gape, open-mouthed]. In 

 biology, irregularly gaping ; applied to a bilabiate 

 corolla when the throat is wide open or gaping ; oppo- 

 site of personate. 



Rinmann's Green. See Pigments, Conspectus of. 



Rinne's Test. This consists in applying a vibrating tun- 

 ing-fork with moderate pressure first over the mastoid 

 process, leaving it there until the patient seems no 

 longer to hear the sound, and then as quickly as pos- 

 sible bringing it immediately in front of the external 

 meatus, avoiding all contact with the head or ear. 

 If the patient then is able to hear the sound of the 

 tuning-fork once more, it indicates that the conduction 

 through the air is better than through the bone, and 

 vice versa. 



Rinolite (ri f -no-lit). See Rhinolith. 



Riolan, Bouquet of. See Bouquet. R., Meso- 

 colic Arch of, the arch of mesentery attached to the 

 transverse meso-colon. R.'s Muscle. See Muscles, 

 Table of. R.'s Nosegay. See Nosegay and Bou- 

 quet. 



Ripa {ri'-pah) \ripa, a bank]. The line formed by the 

 reflection of the endyma upon any plexus or tela of the 

 brain. 



Riparial, Riparious {ri-pa' -re-al , ri-pa f -re-us) \ripa, 

 the bank of a stream or body of water]. Living on 

 or associated with, or pertaining to the shore. 



Ripault Sign. See Death. 



Ripe {rip) [ME. , ripe, ripe]. Mature. 



Ripening (rip / -en-ing) [ME., ripe, ripe]. Becoming 

 mature. R. of Cataract. See Cataract. R. of 

 Cream, the allowing of cream to sour before churning, 

 whereby a larger amount of butter is obtained. The 

 process is attended with a multiplication of bacteria, 



the proper temperature for ripening being that at which 

 the bacteria best multiply. It is attended with the 

 production of lactic acid and various decomposition- 

 processes. 

 Risidontrophy {riz-id-on' -tro-fe) [p^a, a root]. The 



operation of drilling the root of a tooth. 

 Rising (i-i'-zing) [ME., risen, to rise]. A popular 

 term for an inflammatory swelling. R. of the Lights, 

 a popular term for pleurisy and for croup. 

 Risipola lombarda (riz-ip-o' '-lah lom-bar'-dah). Syn- 

 onym of Pellagra. 

 Risorius [ri-zo' -re-us) [ridere, to laugh]. The upper 

 portion of the Platysma myoides. It controls certain 

 motions of the lips and adjacent parts in laughing. 

 See Muscles, liable of. 

 Ristorum (ris-to f -rum) [L.]. A nutritive preparation 



of egg-yolk. 

 Risus {ri'-zus) [L.]. A grin or laugh. R. sardoni- 

 cus, an involuntary sardonic or convulsive grin or 

 drawing down of the angles of the mouth in certain 

 spasmodic or tetanic conditions. 

 Ritgen's Method. A method of manual delivery of 

 the fetal head. It consists in lifting the head upward I 

 and forward through the vulva, between the pain^, by 

 pressure made with the tips of the fingers upon the ; 

 perineum behind the anus close to the extremity of j 

 the coccyx. 

 Ritter's Disease. See Dermatitis exfoliativa neona- 

 torum and Diseases, Table of. R.'s Law of Contrac- 1 

 tion, " a nerve is stimulated both at the moment of | 

 the occurrence and that of the disappearance of elec- j 

 trotonus : (i) When the current is closed, the stimula- 

 tion occurs only at the kathode, i.e., at the moment! 

 when the kathelectrotonus takes place ; (2) when the 

 current is opened, stimulation occurs only at the a 

 i.e., at the moment when the anelectrotonus di> 

 appears." (Landois and Stirling.) R.'s Opening: 

 Tetanus. See Tetanus. R.'s Tetanus, a temporary 

 tetanic state caused by sending a constant cum 

 electricity to a nerve and then suddenly interrupting it. 

 R.-Valli Law, "If a nerve be separated from its 

 center, or if the center die, the excitability ol 

 nerve is at first increased; the excitability then] 

 falls until it disappears entirely. This process take-! 

 place more rapidly in the central than in the peripheral 

 part of the nerve, so that the peripheral end 

 nerve separated from its center remains excitabh 

 longer time than the central end." (Landois UK 

 Stirling.) See Law. 

 Rivallie's Paste. A caustic made by adding concen 



(rated nitric acid to lint. 

 Riverius, Salt of. An old name for normal j 



citrate. 

 Rivini, or Rivinus, Canal of. See R., Ducts of. R. 

 Ducts of, the excretory ducts of the subli 

 gland. R., Foramen of, an opening in the tympawm 

 of doubtful existence. R., Glands of, the subli 

 glands. R., Notch of, a notch in the osseous tym 

 panic ring, filled by Shrapnell's Membrane. R., Seg 

 ment of, an opening in the upper and anteii 

 the annulus tympanicus. 

 Rivolta's Disease. Synonym of Actinomycosis. 

 Rivose (ri'-voz) [rivus, a stream, channel, gi 

 biology, marked with furrows that are sinuate 

 than parallel. 

 Rivulose (nv'-u-ldz) [r/'vulus, a small stream]. In I 



ology, marked with small sinuate lines. 

 Rivus" \ri'-vus) [L. , " a stream : pl.,Rivi]. Any E> 

 of the smaller conduits of the subarachnoidean 

 R. lacrymalis. See Palpebra. 

 Riziform (riz f - if or m). Having an appearance r 

 bling grains of rice. 



