Your triceps brachii muscles are located on the back of your upper arm , between the shoulder and elbow.

Triceps Anatomy Basics

The triceps, meaning "three heads," consist of three distinct parts that work together for arm extension. The long head starts at the scapula (shoulder blade) and runs down the inner back of the upper arm; the lateral head sits on the outer side, giving that defined "horseshoe" shape; and the medial head lies deeper between them, originating from the humerus (upper arm bone). All three converge into a single tendon attaching to the ulna at the elbow.

This setup powers everyday moves like pushing doors or swimming, making up about two-thirds of your arm's mass—way more than biceps.

Quick Functions

  • Elbow extension : Straightens your arm, key for presses or throws.
  • Shoulder adduction : Pulls arm toward body (long head only).
  • Stability : Aids overhead motions and posture.

Why Feel Them?

Flex your arm and push against a wall—feel the bulge on the back? That's your triceps firing, often overlooked but essential for bigger, balanced arms. Gym- goers on forums like Reddit rave about targeting all heads for that "pop," sharing routines since timeless anatomy posts like "Triceps 101" still trend in fitness circles.

TL;DR : Back of upper arm, three-headed powerhouse for pushing.

Information gathered from public forums or data available on the internet and portrayed here.