Medial head

Schematic anatomy
Deep layerMedial head

Biceps

Long headShort headBrachialis · supporting muscle

Triceps

Long headLateral headMedial head

Forearms

BrachioradialisFlexor carpi radialisFlexor carpi ulnarisFlexor digitorum superficialisFlexor digitorum profundusFlexor pollicis longusExtensor carpi radialis longus & brevisExtensor carpi ulnarisExtensor digitorumExtensor pollicis longus & brevisAbductor pollicis longusPronator teresPronator quadratusSupinator

Hands

Abductor pollicis brevisFlexor pollicis brevisOpponens pollicisAdductor pollicisHypothenar musclesLumbricalsDorsal interosseiPalmar interossei
Movement guide

Medial head

The deeper head supports elbow extension across a wide range of movements.

The medial head works alongside the other heads during elbow extension.

01

Cable pressdown

Isolation · Cable

Also works

Long and lateral triceps heads

How to perform

Stand tall with elbows at your sides. Extend the elbows to move the handle down, then return under control.

Keep the upper arms still and wrists neutral.

Example volume · 3 sets × 10–15 reps

02

Overhead cable extension

Isolation · Cable

Also works

Long and lateral triceps heads

How to perform

Face away from a low cable with hands overhead. Extend your elbows, then return slowly.

Keep your trunk braced and use a comfortable shoulder position.

Example volume · 3 sets × 10–15 reps

Referencesopenstax.org

Community draft · awaiting expert review