Triceps Brachii

Musculus triceps brachii

Upper Body Upper BodyArmsTricepsPush

The triceps brachii is the large three-headed extensor of the posterior arm and the prime mover of elbow extension, making up roughly two-thirds of upper-arm mass. The long head also crosses the shoulder, so overhead movements (overhead extensions, French press) lengthen and emphasize it, while the lateral head creates the visible horseshoe and the medial head works in all positions. It is the dominant muscle in all pressing and lockout strength, from bench press to dips and pushdowns.

Actions

Elbow extension, Shoulder extension (long head), Shoulder adduction (long head)

Origin

Long head: infraglenoid tubercle of the scapula; Lateral head: posterior humerus above the radial groove; Medial head: posterior humerus below the radial groove

Insertion

Olecranon process of the ulna and posterior capsule of the elbow joint

Innervation

Radial nerve (C6–C8); long head occasionally by the axillary nerve

Blood supply

Deep brachial artery (profunda brachii); posterior circumflex humeral artery to the long head

Heads

Long head, Lateral head, Medial head

Wikipedia ↗

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