Deltoid Muscle

The deltoid muscle is the triangular muscle of the shoulder that forms the rounded flesh of the outer part of the upper arm. It passes up and over the shoulder joint. The wide end of the triangle is attached to the shoulder blade (scapula) and the collarbone (clavicle). The apex of the triangle is attached to the upper arm bone (humerus), about halfway down its length. Its strongest point is the central section, which raises the arm sideways. The front and back parts of the muscle twist the...

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Anatomy Terms

Acromioclavicular Ligament
Biceps Brachii Muscle (Long Head)
Biceps Brachii Muscle (Short Head)
Brachialis Muscle
Capsular Ligament of the Shoulder
Clavicle
Coracobrachialis Muscle
Costal Cartilage
Deltoid Muscle
False Ribs
Humerus
Infraspinatus Muscle
Latissimus Dorsi Muscle
Levator Scapulae Muscle
Omohyoid Muscle
Pectoralis Minor Muscle
Scapula
Subscapularis Muscle
Superior Transverse Scapular Ligament
Supraspinatus Muscle
Teres Major Muscle
Teres Minor Muscle
Trapezius Muscle
Triceps Brachii Muscle (Lateral Head)
Triceps Brachii Muscle (Long Head)
True Ribs

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Full Deltoid Muscle Description

[Continued from above] . . . arm. The ligaments that connect the muscles to the bone endings are called deltoid ligaments. Deltoid comes from the Greek word deltoides, meaning shaped like a (river) delta.