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Protraction and retraction is an anterior (protraction) or posterior (retraction) movement, [44] such as of the arm at the shoulders, although these terms have been criticised as non-specific. [ 45 ] Reciprocal motion is alternating motions in opposing directions.
The major muscles involved in retraction include the rhomboid major muscle, rhomboid minor muscle and trapezius muscle, [2] [3] whereas the major muscles involved in protraction include the serratus anterior and pectoralis minor muscles. [4] [5]
In topology, a branch of mathematics, a retraction is a continuous mapping from a topological space into a subspace that preserves the position of all points in that subspace. [1] The subspace is then called a retract of the original space.
Retraction or retract(ed) may refer to: Academia. Retraction in academic publishing, withdrawals of previously published academic journal articles; Mathematics
An example of trapezius function is an overhead press. When activating together, the upper and lower fibers also assist the middle fibers (along with other muscles such as the rhomboids) with scapular retraction/adduction. The trapezius also assists in abduction of the shoulder above 90 degrees by rotating the glenoid upward.
The sternoclavicular joint allows movement of the clavicle in three planes, predominantly in the anteroposterior and vertical planes, although some rotation also occurs. A description of movement would be elevation and depression.
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In anatomy, internal rotation (also known as medial rotation) is an anatomical term referring to rotation towards the center of the body. Muscles.