| Trautmann's triangular space | The area of the temporal bone bounded by the sigmoid sinus, the superior petrosal sinus, and a tangent to the posterior saemicircular canal. (05 Mar 2000) |
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| triangular | 1. Having three angles; having the form of a triangle. 2. <botany> Oblong or elongated, and having three lateral angles; as, a triangular seed, leaf, or stem. Triangular compasses, compasses with three legs for taking off the angular points of a triangle, or any three points at the same time. <zoology> Triangular crab, any maioid crab; so called because the carapace is usually triangular. <mathematics> Triangular numbers, the series of numbers formed by the successive sums of the terms of an arithmetical progression, of which the first term and the common difference are 1. See Figurate numbers, under Figurate. Origin: L. Triangularis: cf. F. Triangulaire. Source: Websters Dictionary (01 Mar 1998) |
| triangular bandage | A piece of cloth cut in the shape of a right-angled triangle, used as a sling. Synonym: scarf bandage. (05 Mar 2000) |
| triangular bone | An independent ossicle sometimes present in the tarsus; usually it forms part of the talus, constituting the lateral tubercle of the posterior process. Synonym: os triangulare, triangular bone. (05 Mar 2000) |
| triangular cartilage | The disk that holds together the distal ends of the radius and ulna; it is attached by its apex to a depression between the styloid process and distal surface of the head of the ulna, and by its base to the ridge separating the ulnar notch from the carpal surface of the radius. Synonym: discus articularis radioulnaris, radioulnar disk, radioulnar articular disk, triangular cartilage, triangular disk of wrist, triquetrous cartilage. (05 Mar 2000) |
| triangular crest | A crest or ridge which extends from the apex of a cusp of a premolar or molar tooth toward the central part of the occlusal surface. Synonym: triangular crest, triangular ridge. (05 Mar 2000) |
| triangular disk of wrist | The disk that holds together the distal ends of the radius and ulna; it is attached by its apex to a depression between the styloid process and distal surface of the head of the ulna, and by its base to the ridge separating the ulnar notch from the carpal surface of the radius. Synonym: discus articularis radioulnaris, radioulnar disk, radioulnar articular disk, triangular cartilage, triangular disk of wrist, triquetrous cartilage. (05 Mar 2000) |
| triangular fascia | <anatomy> A triangular fibrous band extending from the aponeurosis of the external oblique to the pubic tubercle of the opposite side. See: aponeurosis of external abdominal oblique muscle. Synonym: ligamentum reflexum, Colles' ligament, fascia triangularis abdominis, reflex ligament, triangular fascia. (05 Mar 2000) |
| triangular fold | A fold of mucous membrane anterior to the palatine tonsil arising from the palatoglossal arch. Synonym: plica triangularis. (05 Mar 2000) |
| triangular fossa | The depression at the upper part of the auricle between the two crura of the anthelix. Synonym: fossa triangularis, fossa navicularis auriculae. (05 Mar 2000) |
| triangular fovea of arytenoid cartilage | A deep depression in the upper portion of the anterolateral surface of the arytenoid cartilage, lodging glands. Synonym: fovea triangularis cartilaginis arytenoideae, triangular pit of arytenoid cartilage. (05 Mar 2000) |
| triangular lamella | A double fold of pia mater, enclosing subarachnoid trabeculae, between the fornix above and the epithelial roof of the third ventricle and the thalami below; at each lateral margin is a vascular fringe projecting into the choroidal fissure of the lateral ventricle; on its undersurface are several small vascular projections filling the folds of the ependymal roof of the third ventricle. Synonym: tela choroidea ventriculi tertii, tela choroidea superior, triangular lamella, velum interpositum, velum triangulare. (05 Mar 2000) |
| triangular ligament | The layer of fascia extending between the ischiopubic rami inferior to the sphincter urethrae and the deep transverse perineal muscles. Synonym: membrana perinei, fascia diaphragmatis urogenitalis inferior, Camper's ligament, ligamentum triangulare, perineal membrane, triangular ligament. (05 Mar 2000) |
| triangular ligaments of liver | See: right triangular ligament, left triangular ligament. (05 Mar 2000) |
| triangular muscle | <anatomy> A muscle that is triangular in shape. Synonym: musculus triangularis. Synonym: depressor anguli oris muscle. (05 Mar 2000) |