trigonum

(tri-go’num) [L.; Gr. τρίγωνον triangle]. Any triangular space or patch. t. acus’tic i, a triangular area on the lower half of the dorsal surface of the medulla, bounded externally by the réstiform body, internally by the hypoglo al triangle, and above by the stria acustice. t. cerebra‘le, the fornix of the cerebrum. t. cervica‘le. 1. A carotid triangle. 2. The basal portion of the posterior gray horn of the spinal cord. t. clavopectora’le, a triangle on the chest bounded by the clavicle, the pectoral is minor, and the thorax. t. col later a’le, an area in the pars central is of the lateral ventricle of the brain hetween the posterior and descending horns. t. coraco-acromia‘le, a triangle bounded by the coracoid proce , the apex of the acromion, and the concave border of the clavicle. t. dorsa’le, the space between the anterior pair of corpora quadrigemina. t. du’rum, the space between the anterior corpora quadrigemina. t. femora‘le. See inguinal triangle, under fri angle. t. haben’ule, a triangular area in the optic thalamus, between the pulvinar, habenula, and midbrain. t. hypoglos’si, a whitish field on the floor of the fourth ventricle whence arises the twelfth cranial nerve. t. interpeduncula’re, a space between the peduncles of the cerebral crura. Ὅ. lemnis’ci, a triangular region on the upper part of the outer side of the brachium -conjunct i vum. t.lumba’le. See Petit's trianule, under triangle. t. olfacto’rium, the triangular area of gray matter between the roots of the olfac- 1031 TRIMORPHOUS tory tract. t. omoclavicula’re, the subclavian triangle. t. va’gi, a dark area on the floor of the fourth ventricle, whence the ninth and tenth cranial nerves take their origin. t. ventric’uli, trigonum collate rale. t. vesi’ces, the triangular area of the interior of the bladder, between the opening of the ureters and the orifice of the urethra. trihydrate (tri-bi’drit). Trihydroxid; a compound in which there is one radical of hydroxyl to three atoms of the base. trihydric (tri-hi’drik). Containing three hydrogen atoms that are replaceable by bases. trihydroxid (tri-hi-droks’id). See trihydrate. tri-iniodymus (tri”’in-e-od’im-us) [Gr. rpets three + ἱνίον nape of the neck + δίδυμος double]. A monster with a single body and three heads united