# triangle

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Related to acute triangle: Sine law

## triangle

[tri´ang-g'l]a three-cornered object, figure, or area, such as a delineated area on the surface of the body; called also trigone.

**carotid triangle, inferior**that between the median line of the neck in front, the sternocleidomastoid muscle, and the anterior belly of the omohyoid muscle.

**carotid triangle, superior**carotid trigone.

**cephalic triangle**one on the anteroposterior plane of the skull, between lines from the occiput to the forehead and to the chin, and from the chin to the forehead.

**digastric triangle**submandibular triangle.

**Einthoven's triangle**an imaginary equilateral triangle with the heart at its center, formed by the axes of the three bipolar limb leads.

**triangle of elbow**a triangular area on the front of the elbow, bounded by the brachioradial muscle on the outside and the round pronator muscle inside, with the base toward the humerus.

**triangle of election**superior carotid triangle.

**facial triangle**a triangular area whose points are the basion and the alveolar and nasal points.

**femoral triangle**the area formed superiorly by the inguinal ligament, laterally by the sartorius muscle, and medially by the adductor longus muscle; called also Scarpa's triangle.

**infraclavicular triangle**that formed by the clavicle above, the upper border of the greater pectoral muscle on the inside, and the anterior border of the deltoid muscle on the outside.

**inguinal triangle**the triangular area bounded by the inner edge of the sartorius muscle, the inguinal ligament, and the outer edge of the long adductor muscle.

**lumbocostoabdominal triangle**that lying between the external oblique muscle of the abdomen, the posterior inferior serratus muscle, the erector muscle of the spine, and the internal oblique muscle of the abdomen.

**occipital triangle**the area bounded by the sternocleidomastoid muscle in front, the trapezius muscle behind, and the omohyoid muscle below.

**Scarpa's triangle**femoral triangle.

**subclavian triangle**a triangular area bounded by the clavicle, the sternocleidomastoid muscle, and the omohyoid muscle.

**suboccipital triangle**that lying between the posterior greater rectus muscle of the head and the superior and inferior oblique muscles of the head.

## tri·an·gle

(trī'ang-gĕl), [TA]In anatomy and surgery, a three-sided area with arbitrary or natural boundaries.

See also: trigonum, region.

See also: trigonum, region.

[L.

*triangulum,*fr.*tri-*, three, +*angulus,*angle]## triangle

/tri·an·gle/ (tri´ang-g'l) trigone; a three-cornered figure or area, such as on the surface of the body.**anal triangle**the portion of the perineal region surrounding the anus.

**carotid triangle, inferior**the part of the carotid trigone medial to the omohyoid muscle.

**carotid triangle, superior**carotid trigone.

**cephalic triangle**one on the anteroposterior plane of skull, between lines from the occiput to the forehead and to the chin, and from the chin to the forehead.

**Codman's triangle**a triangular area visible radiographically where the periosteum, elevated by a bone tumor, rejoins the cortex of normal bone.

**digastric triangle**submandibular t.

**triangle of elbow**in front, the supinator longus on the outside and pronator teres inside, the base toward the humerus.

**facial triangle**a triangle whose points are the basion, and alveolar and nasal points.

**Farabeuf's triangle**one in the upper part of the neck bound by the internal jugular vein, the facial nerve, and the hypoglossal nerve.

**femoral triangle**

**1.**the area formed superiorly by the inguinal ligament, laterally by the sartorius muscle, and medially by the adductor longus muscle.

**2.**the surface area of the thigh overlying this area.

**frontal triangle**one bounded by the maximum frontal diameter and the lines to the glabella.

**Hesselbach's triangle**inguinal t. (1).

**iliofemoral triangle**one formed by Nélaton's line, another line through the superior iliac spine, and a third from this to the greater trochanter.

**infraclavicular triangle**one formed by the clavicle above, upper border of the pectoralis major on the inside, and the anterior border of the deltoid on the outside.

**inguinal triangle**

**1.**the area on the inferoanterior abdominal wall bounded by the rectus abdominis muscle, the inguinal ligament, and inferior epigastric vessels.

**2.**femoral t. (1).

**triangle of Koch**a roughly triangular area on the septal wall of the right atrium, between the tricuspid valve, coronary sinus orifice, and tendon of Todaro, that marks the site of the atrioventricular node.

**Langenbeck's triangle**one whose apex is the anterior superior iliac spine, its base the anatomic neck of the femur, and its external side the external base of the greater trochanter.

**Lesser's triangle**one formed by the hypoglossal nerve above, and the two bellies of the digastricus on the two sides.

**lumbar triangle**Petit's t.

**lumbocostoabdominal triangle**one between the obliquus externus, the serratus posterior inferior, the erector spinae, and the obliquus internus.

**Macewen's triangle**mastoid fossa.

**occipital triangle**one having the sternomastoid in front, the trapezius behind, and the omohyoid below.

**occipital triangle, inferior**one having a line between the two mastoid processes as its base and the inion its apex.

**omoclavicular triangle**subclavian t.

**Pawlik's triangle**an area on the anterior vaginal wall corresponding to the trigone of the bladder.

**Petit's triangle**the inferolateral margin of the latissimus dorsi and the external oblique muscle of the abdomen.

**Scarpa's triangle**femoral t. (1).

**subclavian triangle**a deep region of the neck: the triangular area bounded by the clavicle, sternocleidomastoid, and omohyoid.

**submandibular triangle**,

**submaxillary triangle**the triangular region of the neck bounded by the mandible, the stylohyoid muscle and posterior belly of the digastric muscle, and the anterior belly of the digastric muscle.

**suboccipital triangle**one between the rectus capitis posterior major and superior and inferior oblique muscles.

**supraclavicular triangle**subclavian t.

**suprameatal triangle**mastoid fossa.

## triangle

Etymology: L,

*triangulus,*three-cornereda predictable emotional process that takes place when there is difficulty in a relationship. Triangles represent dysfunctional efforts to reduce fusion or conflict in a relationship. The three corners of a triangle can be composed of three people or two people and an object, group, or issue.

## tri·an·gle

(trī'ang-gĕl) [TA]anatomy, surgery A three-sided area with arbitrary or natural boundaries.

See also: trigonum, region

See also: trigonum, region

[L.

*triangulum,*fr.*tri-*, three, +*angulus,*angle]## tri·an·gle

(trī'ang-gĕl) [TA]In anatomy and surgery, three-sided area with arbitrary or natural boundaries.

[L.

*triangulum,*fr.*tri-*, three, +*angulus,*angle]## triangle

a three-cornered object, figure or area, as such an area on the surface of the body capable of fairly precise definition. Called also trigone.

**facial triangle**

a triangular area whose points are the basion and the alveolar and nasal points.

**femoral triangle**

the triangle bounded cranially by the sartorius, caudally by the pectineus and deeply by the iliopsoas muscles in the dog. The pulse of the femoral artery can be taken at this site.

**vesical triangle**

the area of the bladder wall within the triangle demarcated by the ureteral and urethral orifices. The bladder mucosa is firmly attached at this point and does not form folds.

**Viborg's triangle**

a surgical site on the side of the throat of the horse bounded by the caudal border of the mandible, the linguofacial vein and the tendon of the sternocephalic muscle.

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