Tweed triangle

Tweed triangle

Etymology: Charles Tweed, American dentist, 1895-1970; L, triangulus, three-cornered

the triangle formed by the mandibular plane, the Frankfurt horizontal plane, and the long axis of the lower central incisor. It is used as a diagnostic aid.

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triangle,

n a three-cornered area.

triangle, anterior cervical,

n one of two major triangles delineated by the sternocleidomastoid muscles, it extends approximately from the inferior part of the neck to the mandible.

triangle, Bolton,

n.pr a triangle formed by drawing a line from the nasion to the sella turcica and from there to the Bolton point.

triangle, Bonwill,

n.pr an equilateral triangle with 4-inch (10-cm) sides bounded by lines from the contact points of the mandibular central incisors (or the median line of the residual ridge of the mandible) to the condyle on either side and from one condyle to the other. It is the basis for Bonwill's theory of occlusion.

triangle, carotid,

n also called the superior carotid triangle. The region of the neck bounded by the posterior belly of digastric muscle, the superior belly of the omohyoid muscle, and the anterior border of sternomastoid muscle. The carotid triangle contains numerous veins, arteries, and nerves.

triangle, cervical, posterior,

n a region of the neck containing numerous vein, artery, and lymph node structures.

triangle, hyoid,

n an area consisting of the hyoid bone and its ligaments, located in front of the throat above the Adam's apple. The presence of a raised, or positive, hyoid triangle is indicative of neck or jaw injury.

triangle, submandibular,

n a region in the neck bounded by the mandible and the anterior and posterior bellies of the digastric muscle; contains the submandibular gland. Also known as the
digastric triangle or the
submaxillary triangle.

triangle, submental,

n a region in the neck bounded by the anterior belly of the gastric muscle, the midline of the neck, and the hyoid bone. Its floor is the mylohyoid muscle, and it contains the submental lymph nodes, the anterior jugular vein, and the submental artery.

triangle, Tweed,

n.pr a triangle formed by the mandibular plane, Frankfort plane, and long axis of the mandibular central incisor. Proposed as a diagnostic aid by C.H. Tweed.