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Muscle origins and insertions describe the places where a muscle attaches on bones. Conventionally, a muscle origin describes the attachment of a muscle on the more stable bone. The insertion then, is the attachment of a muscle on the more moveable bone. The action of the muscle describes what happens when the more mobile bone is brought toward ...
origin: [ or´ĭ-jin ] the source or beginning of anything, especially the more fixed end or attachment of a muscle (as distinguished from its insertion), or the site of emergence of a peripheral nerve from the central nervous system.
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Origin. The origin of a muscle is the bone, typically proximal, which has greater mass and is more stable during a contraction than a muscle's insertion. For example, with the latissimus dorsi muscle, the origin site is the torso, and the insertion is the arm. When this muscle contracts, normally the arm moves due to having less mass than the ...
A muscle’s origin is usually at the attachment of its tendon to the bone with greater mass and stability. Bones at the origin of a muscle are typically those nearer the axis of the skeleton, proximal. The bone at a muscle’s insertion point is usually lighter and distal. The illustration below displays the origins and insertions of the ...
Dec 26, 2018 · The origin and insertion refer to the anatomic locations of where a muscle attaches (usually a bone). The origin refers to the proximal attachment site that remains relatively fixed during contraction. The insertion refers to the muscle’s distal attachment site to a moveable bone. In simple terms, when a muscle shortens, the point of origin ...
The origin is the fixed attachment, while the insertion moves with contraction. The action, or particular movement of a muscle, can be described relative to the joint or the body part moved.
Oct 30, 2023 · The origin at the scapula and the insertion into the radius of the biceps brachii means it can act on both the shoulder joint and the elbow joint, which is why this muscle participates in a few movements of the arm. It derives its name from its two heads which merge in one unique distal body, defining the unusual structure of the muscle.
