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May 4, 2023 · The ability to abduct the arm is a crucial contributor to the full range of motion of the arm. Four different muscles control this action: supraspinatus, deltoid, trapezius, and serratus anterior. [2] [3] [4] [5] The supraspinatus is the primary muscle for the abduction of the arm to 15 degrees.
May 15, 2000 · With the arm internally rotated (palm down), abduction continues to 120 degrees. Beyond 120 degrees, full abduction is possible only when the humerus is externally rotated (palm up).
Aug 6, 2021 · abduct arm to 90°, angle forward 30° (bringing it into the scapular plane), and internally rotate (thumb pointing to floor). Then press down on arm while patient attempts to maintain position testing for weakness or pain.
Oct 30, 2023 · The deltoid muscle (acromial part) is the principal abductor of the arm at the glenohumeral joint. However, it can only do so, when the arm is already abducted beyond fifteen degrees. This initial part of abduction is produced by the supraspinatus muscle.
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Nov 13, 2023 · Arm (brachium) The layman will refer to the entire upper limb as the arm. However, the anatomist knows that the ‘arm’ or the ‘brachium’ is purely the region between the shoulder joint and elbow. There are relatively few muscles which its movements and function are easy to learn. Brachialis
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- 25 min
Skeletal muscles: Supraspinatus, deltoid, trapezius, and serratus anterior. Cutaneous distribution: None except for the axillary nerve. Neuromuscular deficit: Weakness/paralysis when abducting at the shoulder under resistance. In normal subjects the supraspinatus initiates the first 15 degrees of abduction along the vertical plane. The deltoid ...
Abduction of the arm happens in the frontal plane and can be described as the arm's movement away from the body's midline. So, abduction at the shoulder joint causes the free upper limb to move away from the body.
