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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 ...
A skeletal muscle attaches to bone (or sometimes other muscles or tissues) at two or more places. If the place is a bone that remains immobile for an action, the attachment is called an origin. If the place is on the bone that moves during the action, the attachment is called an insertion.
Oct 30, 2023 · The biceps brachii muscle is one of the chief muscles of the arm . 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 ...
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Nov 3, 2023 · Origin and insertion. The external intercostal muscles consist of 11 pairs of muscles. Every external intercostal originates from the sharp inferior costal border of one rib. The fibers of each muscle course inferomedially and insert along the outer lip of the superior border of the immediate rib below. Inferior border of rib.
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Oct 30, 2023 · Function. The main function of the trapezius is stabilizing the scapula in its anatomical place, as well as controlling it during movements of the shoulder and upper limb. The throwing action is a common manoeuvre in which the trapezius muscle is active, along with the deltoid muscle and the rotator cuff muscles.
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Feb 23, 2024 · Muscle insertion is the point where the muscle attaches to the bone or structure that it moves. This is usually the more mobile end of the muscle, located distally, or further from the center of the body. When the muscle contracts, it pulls on this insertion point, causing movement.
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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 ...
