triangle

(tri’ang-l) [L. tri an’gulum; tres three + an’gul us angle]. 1. three-cornered area or figure. 2. A triangular bandage. Alsberg’s t., a triangle formed by a line pa ing through the long axis of the femur, a second line pa ing through the long axis of the neck of the femur, and a third line on a plane pa ing through the base of the head of the femur. It forms an equilateral triangle with its apex upward. The angle at the apex is known as Alsberg’s angle, or angle of elevation. anterior t., that which is divided by the omohyoid below and the digastric us above into the inferior carotid, superior carotid, and submaxillary triangle. A é6zat’s t., a triangle bounded by lines joining the alveolar and basal points and the nasion. auricular t., a triangle bounded by lines drawn from the tip of the auricle and the two ends of its base of insertion. t. of auscultation, the area limited by the lower edge of the trapezius, the lat is sim us dors i, and the vertebral border of the scapula. brachial t., the triangle situated on the under surface of the arm, the axilla, and the outer surface of the chest. Bryant’s t., the i leo femoral triangle. cardio hepatic t., the triangular snace in the fifth intercostal space of the right side, separating the heart from the upper edge of the liver. carotid t., inferior, a triangle formed by the median line of the neck in front, the sternomastoid, and the anterior belly of the omohyoid muscle. Called also ¢. of nece ity. carotid t., superior, one having the anterior belly of the omohyoid in front, the posterior belly of the digastric us above, and the sternomastoid behind. Called also ¢. of election. cephalic t., a triangle on the anteroposterior plane of the skull, between the lines from the occiput to the forehead and to the chin, and the third from the chin to the forehead. cervical t’s. See triangles of the neck. Gigastric t., the submaxillary triangle. t. of the elbow, one on the front of the elbow, having the supinator long us on the outside and the pronator teres inside, the A set of lenses used 1026