Trapezius vs. Rhomboid

Trapeziusnoun

(anatomy) A large vertebrate skeletal muscle divided into an ascending, descending, and transverse portion, attaching the neck and central spine to the outer extremity of the scapula; it functions in scapular elevation, adduction, and depression.

‘The trapezius muscle resembles a trapezium (trapezoid in American English), or diamond-shaped quadrilateral. The word "spinotrapezius" refers to the human trapezius, although it is not commonly used in modern texts. In other mammals, it refers to a portion of the analogous muscle.’;

Rhomboidnoun

A parallelogram which is neither a rhombus nor a rectangle

Trapeziusnoun

either of two flat triangular muscles of the shoulder and upper back that are involved in moving the shoulders and arms

Rhomboidnoun

Any of several muscles that control the shoulders

Trapezius

The trapezius is a large paired trapezoid-shaped surface muscle that extends longitudinally from the occipital bone to the lower thoracic vertebrae of the spine and laterally to the spine of the scapula. It moves the scapula and supports the arm.

Rhomboidnoun

A solid shape which has rhombic faces

Rhomboidadjective

resembling, or shaped like a rhombus or rhomboid

Rhomboidnoun

An oblique-angled parallelogram like a rhomb, but having only the opposite sides equal, the length and with being different.

Rhomboidadjective

Same as Rhomboidal.

Rhomboidnoun

a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal

Rhomboidnoun

any of several muscles of the upper back that help move the shoulder blade

Rhomboidadjective

shaped like a rhombus or rhomboid;

‘rhomboidal shapes’;

Rhomboid

Traditionally, in two-dimensional geometry, a rhomboid is a parallelogram in which adjacent sides are of unequal lengths and angles are non-right angled. A parallelogram with sides of equal length (equilateral) is a rhombus but not a rhomboid.