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The middle (middle) deltoid: Responsible for shoulder abduction (lifting the arm away from the body). The posterior (back) deltoid: Assists with shoulder extension and outward rotation.
The deltoid muscle is the muscle [1] forming the rounded contour of the human shoulder. It is also known as the 'common shoulder muscle', particularly in other animals such as the domestic cat. Anatomically, the deltoid muscle is made up of three distinct sets of muscle fibers, namely the anterior or clavicular part (pars clavicularis)
Abduction and adduction of the shoulder (frontal plane). Abduction is carried out by the deltoid and the supraspinatus in the first 90 degrees. From 90-180 degrees it is the trapezius and the serratus anterior. Adduction is carried out by the pectoralis major, latissimus dorsi, teres major and the subscapularis. Horizontal abduction and ...
Contraction of each part of the deltoid assists in different movements of the shoulder - flexion (clavicular part), abduction (middle part) and extension (scapular part). [3] The teres major attaches to the outer part of the back of the scapula, beneath the teres minor, and attaches to the upper part of the humerus.
Abduction is an anatomical term of motion referring to a movement which draws a limb ... of arm at shoulder (raising arm) [1] [2] Supraspinatus 0-15; Deltoid 15-90 ...
The anterior (front) and posterior (back) heads of the deltoid will also co-contract to aid in the abduction function. If the shoulder is laterally (externally, outwardly) rotated, the anterior deltoid becomes the prime mover of the glenohumeral joint, the posterior deltoid de-activates, and the middle head assists.
1.1 Arm and shoulder. 1.2 Hand and wrist. ... Adduction is an anatomical term of motion referring to a movement which brings a part of the anatomy closer to the ...
Subacromial bursitis is a condition caused by inflammation of the bursa that separates the superior surface of the supraspinatus tendon (one of the four tendons of the rotator cuff) from the overlying coraco-acromial ligament, acromion, and coracoid (the acromial arch) and from the deep surface of the deltoid muscle. [1]