The deltoid muscle (or musculus deltoideus) 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 …

Sep 24, 2021 · Your deltoid muscles are in your shoulder, which is the ball-and-socket joint that connects your arm to the trunk of your body. Deltoid muscles help you move your arms in different …

The Deltoid muscle is a large triangular-shaped muscle that lies over the glenohumeral joint and which gives the shoulder its rounded contour. It is comprised of three distinct portions (anterior or …

Sep 23, 2025 · The deltoid muscle is one of the main abductors of the shoulder, meaning it helps lift the arm when reaching for objects or brushing the hair. It’s also activated when carrying heavy weights, …

The deltoid, as it is commonly known, originates on the outer front third of the clavicle (collarbone) and the lower margin of the spine of the scapula (shoulder blade). Its fibres unite to form a thick tendon …

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.

Jan 30, 2024 · This muscle forms the shoulder's rounded contour, being thick and spread out anteroposteriorly (see Image. Surface Anatomy of the Right Upper Extremity, Posterior Aspect). The …

Aug 21, 2025 · Your deltoid is a large muscle that helps stabilize and move your shoulder joint. Deltoid injuries like muscle tears or strains can cause severe pain.

Dec 31, 2025 · The deltoid muscle is a rounded, triangular muscle located on the uppermost part of the arm and the top of the shoulder. It is named after the Greek letter delta, which is shaped like an …

Nov 26, 2025 · The deltoid muscle, a triangular powerhouse capping the shoulder, isn't a single entity but a trio of distinct heads, each with its own specialized function. Understanding the roles of the …