TRIANGULAR 



1540 



TRICHADENIA 



urethral, a triangle situated in the perineum. Its 

 boundaries are externally the ischio-cavernosus muscle, 

 internally the bulbo-cavernosus muscle, and posteriorly 

 the transversus perinsei. T. of Scarpa, a triangle . 

 located in the proximal third of the thigh. The bounda- 

 ries are externally the sartorius muscle, internally the 

 adductor longus muscle, and above Poupart's ligament. 

 It is covered by skin and the superficial and deep fasciae. 

 Its floor is formed by the iliacus, psoas, pectineus, ad- 

 ductor longus, and part of the adductor brevis. Its import- 

 ant contents are the femoral artery and vein, the anterior 

 crural nerve, and the crural branch of the genito-crural 

 nerve. Ts., Simon's, the groin, the internal face of 

 the thighs, and the hypogastric region form fat femoral 

 triangle of Simon ; the surface of the axilla, the pectoral 

 region, and the inner aspect of the arm, the brachial tri- 

 angle of Simon. These regions are often the seat of 

 variolous rashes, or roseola; variolosa, which appear on 

 the second and third days of the invasion-stage of small- 

 pox. T., Subclavian, a triangle of the neck bounded 

 cephalad by the dorsal belly of the omo-hyoid muscle, 

 caudad by the upper border of the clavicle. Its base, 

 directed ventrad, is formed by the sterno-mastoid mus- 

 cle. Its floor is made up of the first rib, with the 

 first digitation of the serratus magnus. It contains the 

 subclavian artery and occasionally the vein , the brachial 

 plexus of nerves, the supra-scapular vessels, the transver- 

 salis colli artery and vein, and the external jugular vein. 

 T., Submaxillary, a triangle of the neck formed 

 cephalad by the lower border of the body of the inferior 

 maxilla and a continuation of this line to the mastoid 

 process of the temporal bone, caudad by the dorsal 

 belly of the digastric and the stylo-hyoid muscle, and 

 ventrad by the middle line of the neck. Its floor is 

 made up of the ventral belly of the digastric, the mylo- 

 hyoid and hyo-glossus muscles. It contains the sub- 

 maxillary gland, the facial artery and vein, the sub- 

 mental artery, the mylo-hyoid artery and nerve, and the 

 stylo-maxillary ligament, behind which is the external 

 carotid artery. T., Suboccipital, a triangle in the 

 dorsal part of the neck. It is formed by the rectus 

 capitis posticus major, and superior and inferior oblique 

 muscles. It is covered by the complexus muscle, and 

 contains the vertebral artery. T., Superior (of the 

 neck). Same as T, Carotid, Superior. T., Surgical, 

 a triangular space containing important vessels and 

 nerves which may require to be operated upon. T., 

 Upper Cervical. See T, Carotid, Superior. T., 

 Vesical, a triangle at the base of the bladder — the 

 trigonum of the urinary bladder. The apex is at the 

 beginning of the urethra, and the other two angles art 

 the orifices of the ureters. 



Triangular (tri-ang / -gu-lar) [triangulus, three-cor- 

 nered]. Pertaining to figures with three sides, and 

 applied to a number of such-shaped organs or parts of 

 the body. 



Triangulare (tri-ang-gu-la'-re) [triangularis, three- 

 cornered]. A peculiar bone of the tarsus of some 

 animals. 



Triangularis (tri-ang-gula'-ris). See Muscles, Table 

 of 



Trianthous (tn-an'-thus) [rpelg, three; dvOor, flower]. 

 In biology, three-flowered. 



Triarch (tri' -ark) [rpelc, three; apx^c, ruler]. In biol- 

 ogy, a term descriptive of radial fibro-vascular bundles 

 having three rays. 



Triarsenate (tri-ar'-sen-at). See Arsenate. 



Triatomic (tri-al-om'-ik) [tres, three; atomus, an atom]. 

 In chemistry, consisting of three atoms; applied to the 

 molecules of elements when the atoms are of the same 

 kind. Also, the same as trivalent. Also, having three 

 hydroxyl groups by which other atoms or radicles may 



be attached without altering the structure of the rest o 



the molecule. 

 Triaxial, Triaxon (tri-aks'-e-al, tri-aks'-on) [rpti 



three; dfow, axis]. Having three axes, as son; 



sponge-spicules. 

 Tribadism (tri> '-bad-izm) [rpilieiv, to rub]. Unnatur; 



sexual relations between women. 

 Tribaritic (tri- bar-it' -ik) [tres, three ; bariuni] . Pa 



sessing three atoms of barium. 

 Tribas (trib'-as) [rpifiuv, to rub]. One who practise 



tribadism. 

 Tribasic (tri-ba'-sik) [tres, three; basis, a base]. I 



chemistry, an acid having three hydrogen atoms replace 



able by basic atoms. 

 Tribracteate (tri-brak'-te-dt) [tres, three; bractea, 



thin plate]. In biology, having three bracts. 

 Tribromacetic Acid (tri-brom-as-e' -tik) [rpelr, three 



(iputwc, stench; acetum, vinegar], C 2 Br 3 I10 2 . 



monobasic acid derived from acetic acid and occurrir 



in transparent, prismatic crystals. 

 Tribromid (tri-brom' '-id) [rpeZc, three ; fipib/ioc. stench 



A compound of bromin analogous to a trichlorid. 

 Tribromphenol ( tri - brom -fe' - nol ) [ rpelg, three 



(3p<j/wg, stench; phenol], C 6 H 2 BrOH. A 



prepared by the reaction of carbolic acid with bromi: 



It is antiseptic, especially for the intestinal trac 



Dose gr. j-iv. Unof. T.-bismuth, a reme 



mended as a specific against Asiatic cholera It jfl 



yellow, neutral, insoluble powder, destitute of odoraii 



taste and scarcely poisonous. It contains 49.5 per cer 



of bismuth oxid and 50 per cent, of tribromphene 



The dose is gr. vijss (gram x / 2 ). Unof. 

 Tribulus (trib'-u-lus) [rpifiolog, a caltrop]. A gen 



of polypetalous plants, several varieties of which aj 



used medicinally in European countries and in Africa 

 Tributum (trib-u' -turn) [tribuere, to render]. A tribul 



T. lunare. Synonym of Menstruation. 

 Tributyrin [tri-bu' '-tir-in) [tres, three ; bufyrum, hi 



ter], C 3 H 5 (O.C 4 H 7 0) 3 . A compound found in butt 



It is liquid, and has a sharp, bitter taste. 

 Tricaprin (tri-kap'-rin ) [tres, three ; caper, a goa \ 



C 3 H.(O.C, Hj 9 O) 3 . A substance found in butter a! 



milk. 

 Tricaproin (tri-kap'-ro-in) [tres, three ; caper, a goa ; 



C 3 H 5 (O.C 6 H n O) 3 . A substance found in milk aj 



butter. 

 Tricaprylin (tri-kap' -ril-in) [tres, three ; caper, a goal 



C 3 H 5 (O.C 8 H 15 0) 3 . A substance found in milk a 



butter. 

 Tricapsular (tri-kap' -su-lar) [tres, three; capsula, c 



sule]. In biology, having three capsules. 

 Tricarbon (tri-kar 1 '-bon) [tres, three ; carbo, carlo < 



A radicle containing three atoms of carbon. 

 Tricarpellary (tri-kar' -pel-a-re) [tres, three ; carp 



carpel]. Inbioleigv, having three carpels. 

 Tricarpous (tri-kar' -pus) [rpelg, three; napndg, frw 



In biology, bearing three fruits or three carpels. 

 Tricaudalis (tri-kaw-da'-lis) [tres, three; cauda 



tail]. The retrahens aurem muscle. Socall< 



it is composed of three slips. 

 Tricellular (tri-sel'-u-lar) [Ires, three; cellula, a eel 



Having three cells. 

 Tricephalous (tri- sef- a! - us) [rpelg, tin. 



head]. Having three heads. 

 Tricephalus (tri-sef'-al-us) [rptir, three ; Ke$a 



A form of triple monstrosity in which there is the 



velopment of three heads on one body. 

 Triceps (tri'-seps) [tres, three; caput, head] 



to certain muscles that have three roots at origin. J 



Muscles, Table of. 

 Trichadenia (tr'ikad-e'-ne-ah) [Opt!;, a hair; <i< 



gland]. A genus of the Bixinea:. T. zeylan 1 



