Triceps brachii

A large muscle located at the back of the upper arm that plays a significant role in arm movement and strength.

The triceps brachii is a major muscle of the upper arm, located on the posterior side. It consists of three distinct heads: the long head, lateral head, and medial head. Each head contributes to the muscle's overall function of extending the elbow joint. This muscle is vital in activities that require pushing or lifting.

Terminologia Anatomica

musculus-triceps-brachii

System

Muscular system

Function

The primary function of the triceps brachii is to extend the forearm at the elbow joint. This action is fundamental in a variety of physical activities, including pushing movements like push-ups and bench presses, as well as any movements that require lifting objects overhead. The long head of the triceps also assists in shoulder stabilization, contributing to the overall strength and control of the upper body during dynamic motions. The muscle works in synergy with other muscles, such as the biceps brachii, enabling coordinated arm movements essential in performing daily tasks and athletic activities.

Location

The triceps brachii is located on the dorsal (posterior) aspect of the upper arm, running from the shoulder region down to the elbow. It originates from two sites: the shoulder blade (scapula) for the long head and the humerus bone for the lateral and medial heads. The muscle converges into a single tendon that inserts at the olecranon process, which is the bony point of the elbow, allowing it to effectively exert force for elbow extension.

Did You Know?

The name 'triceps' comes from Latin, meaning 'three-headed,' which reflects the muscle's three distinct points of origin.
While the triceps are primarily known for their role in extension, they also contribute to shoulder movements, especially during overhead activities.
Triceps brachii can make up about two-thirds of the upper arm's muscle mass, playing a crucial role in the overall size and strength of the arm.