Which muscle supports the arm in a position of 90 degrees of abduction?

What muscle abducts the arm above 90 degrees?

The trapezius and serratus anterior muscles work in tandem to coordinate rotation and movement of the scapula to accommodate the full range of motion of the arm. Specifically, they facilitate abduction of the arm from 90 degrees and further upwards.

Which one of the following muscles is involved in abduction of the arm at the shoulder joint?

The supraspinatus muscle initiates the abduction movement of the arm by pulling the humeral head medially towards the glenoid cavity thereby creating a fulcrum for movement.

What muscle controls arm movements?

The pectoralis major, latissimus dorsi, deltoid, and rotator cuff muscles connect to the humerus and move the arm. The muscles that move the forearm are located along the humerus, which include the triceps brachii, biceps brachii, brachialis, and brachioradialis.

What muscles elevate arms?

Supraspinatus is responsible for beginning the upward motion of your arm. After about 15 degrees, the deltoid and trapezius muscles do the work.

Where is the supraspinatus muscle?

The supraspinatus muscle, the most superiorly located of the rotator cuff muscles, resides in the supraspinous fossa of the scapula, superior to the scapular spine.

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Which muscle acts to abduct and extend the arm at the shoulder quizlet?

Supraspinatus: Fully abducting the arm. -Infraspinatus and teres minor: Adduct and laterally rotate the arm. Subdivided into compratments, anterior (flexors) and posterior (extensors).

What muscles do horizontal abduction?

Muscles that Horizontally Abduct the Shoulder

  • Posterior Deltoid.
  • Middle Trapezius.
  • Lower Trapezius.
  • Infraspinatus.
  • Middle Deltoid.
  • Supraspinatus.
  • Teres Minor.
  • Rhomboid Major.