Oct 30, 2023 · Origin, insertion, innervation and functions of the deltoid muscle. The deltoid is a thick, triangular shoulder muscle. It gets its name because of its similar shape to the Greek letter ‘delta’ (Δ). The muscle has a wide origin spanning the clavicle, acromion and spine of scapula.

Apr 23, 2024 · The deltoid is a large, thick triangular skeletal muscle in the shoulder joint, connecting the arm to the body trunk. Its name derives from ‘delta’ (Δ), the Greek letter that it resembles in shape. The deltoids give our shoulder its rounded shape and are responsible for most major arm movements.

The deltoid muscle is a main component of both the bat and pterosaur wing musculature, [17] but in crown-group birds it is strongly reduced, as they favour sternum attached muscles. Some Mesozoic flying theropods, however, had more developed deltoideus.

Axillary neuropathies lead to deltoid muscle dysfunction and cause denervation of the deltoid muscle. Abnormalities of the deltoid may originate from nearby pathologies of the subdeltoid bursa, acromion, and distal clavicle.

Jan 30, 2024 · All striated trunk and limb muscles, including the deltoid, derive from the segmented paraxial mesoderm. The paraxial mesoderm divides into bilaterally paired blocks called somites. Myogenic precursors (myoblasts) in the somites migrate toward developing limb buds during the 5th week of development.

The anterior deltoid takes its origin from the lateral one-third of the clavicle as well as the anterior acromion; the middle deltoid originates from the lateral margin of the acromion; and the posterior deltoid from the scapular spine (Williams & Warwick, 1980).

Origin: Lateral one third of clavicle, acromion and spine of scapula. Insertion: Deltoid tuberosity of humerus. Action: Abducts, flexes, extends, and medially and laterally rotates arm at glenohumeral (shoulder) joint. Innervation: Axillary nerve (C5-C6).

Muscle anatomy of the deltoid includes origin, insertion, action, innervation and vascular supply. Actions include agonists and antagonists for each movement.

Nov 14, 2022 · The deltoid muscle is thick, triangular shaped muscle which arises from the lateral third of the clavicle, the superior acromion process and the spine of the scapular. It attaches to the deltoid tubercle of the lateral proximal humeral shaft.

Origin & Insertion. The deltoid muscle is known for its origin’s distinctive ‘U’ shape, spanning across the clavicle, acromion, and the spine of the scapula. These points specifically include the lateral third of the clavicle, the lateral acromion, and the spine of the scapula [9] [10].