Extensor muscle

In anatomy, extension is a movement of a joint that increases the angle between two bones or body surfaces at a joint. Extension usually results in straightening of the bones or body surfaces involved. For example, extension is produced by extending the flexed (bent) elbow. Straightening of the arm would require extension at the elbow joint. If the head is tilted all the way back, the neck is said to be extended. Extensor musclesUpper limbof arm at shoulderAxilla and shoulder Latissimus dorsiPosterior fibres of deltoidTeres majorof forearm at elbowPosterior compartment of the armTriceps brachiiAnconeusof hand at wristPosterior compartment of the forearmExtensor carpi radialis longusExtensor carpi radialis brevisExtensor carpi ulnarisExtensor digitorumof phalanges, at all joints Posterior compartment of the forearmExtensor digitorumExtensor digiti minimi (little finger only)Extensor indicis (index finger only)of phalanges, at interphalangeal jointsLumbricals of the handDorsal interossei of the handPalmar interosseiof thumbExtensor pollicis brevis (proximal phalange)Extensor pollicis longus (distal phalange)Lower limbHipof thigh/femur at hipGluteus maximusPosterior compartment of thi