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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.
Einthoven's triangle. Bipolar limb leads I, II, and III form Einthoven's triangle. Other standard positions for electrocardiographic leads are the augmented unipolar leads: aVR (right arm), aVL (left arm), and aVF (left leg). From Polaski and Tatro, 1996.
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.
[L. triangulum, fr. tri-, three, + angulus, angle]

tri·an·gle

(trī'ang-gĕl) [TA]
anatomy, surgery A three-sided area with arbitrary or natural boundaries.
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]
References in periodicals archive ?
where L denotes the expected total edge length of the Poisson Voronoi tessellation per unit volume.
The "Beyond" section introduces advanced and related topics concerning tessellations; it is a good section for students to explore individually.
As an example of a homogeneous random spatial tessellation we consider the homogeneous Poisson plane tessellation, which is a plane tessellation induced by a homogeneous Poisson process on the space of planes in [R.sup.3].
2 shows an exemplary tessellation of setup 1 according to the 2-OVD described in Section II, for N = 5 anchors.
We take a 2-dimensional (2D) case as an example to demonstrate how the Voronoi tessellation and Delaunay triangulation may be used to evaluate the uniformity of a group of particles.
Diagnosis of Tessellation. Two of our authors (Minlu Song and Minwen Zhou), masked from patients' basic information and OCT scanning, graded the color fundus photographs independently into normal fundus ([C.sub.0]) and tessellated fundus ([C.sub.1]) based on the classification reported by Ohno-Matsui et al.
For a given deployment B = [B.sup.m] [union] [B.sup.s], each cell coverage can be regarded as a tessellation for a given system coverage R, which can be written as T = {[T.sub.b] | b [member of] B} [member of] [rho](R), where [T.sub.b] denotes the cell coverage for BS b [member of] B and [rho](R) denotes the collection of all partitions of R.
Upon selecting an atomic alphabet and edge-length cutoff as parameters, the energy of any folded protein chain would subsequently be calculated with the atomic four-body potential as follows: label and tessellate the 3D atomic coordinates of the structure according to the same parameters, refer to the previously derived atomic four-body potential under those parameters to assign a score to each tetrahedron in the tessellation equal to the interaction energy of the atomic quadruplet found at its four vertices, and add up the scores of all the tetrahedra in the tessellation.
One common use of tessellation is to dynamically scale the level of detail of a terrain based on the distance from the camera.
In this paper we propose a new ocean simulation using a GPU-based tessellation process.
These scores can be used to compute a total potential for any protein structure, first by using all its amino acid residue C-alpha points to generate the Delaunay tessellation of the protein (subject to removal of all edges longer than 12 [Angstrom]) and then by adding up the scores of the residue quadruplets identified at the four vertices of all the constituent tetrahedra in the tessellation.
As Atassi's one-point perspective opens outward from this "wall" toward the viewer, the dense arrangement of orange, green, and black rectangles disperses into a random tessellation that can also be interpreted as mosaic tiles covering the ceiling, walls, and floor of a mysterious room.