Muscles of Fore arm By,M. Thiru murugan Muscles of fore arm: superficial anterior & deep anterior The superficial anterior compartment are the flexor carpi ulnaris, flexor carpi radialis, palmaris longus, flexor digitorum superficialis & pronator teres Flexor carpi ulnaris: O – humerus & ulna ; I - metacarpal Flexor carpi radialis: O - humerus ; I - metacarpal Palmaris longus: O - humerus; I – palmar aponeurosis Flexor digitorum superficialis: O – humerus, ulna & radius ; I - middle phalanges Pronator teres: O - humerus & ulna ; I - radius Function or Action: Pronation of the forearm, Flexion and abduction at the wrist, Flexes the metacarpophalangeal joints and interphalangeal joints Muscles of fore arm: There are three muscles in the deep anterior forearm: flexor digitorum profundus, flexor pollicis longus, and pronator quadratus. Flexor digitorum profundus: O - ulna; I - distal phalanges (2-5) Flexor pollicis longus: O - radius ; I - distal phalanx of thumb Pronator quadratus: O - ulna; I - radius Function or Action: Flexes the interphalangeal joint and metacarpophalangeal joint, Pronates the forearm Posterior compartment of forearm: Muscles of hand and Fingers: Adductor pollicis Palmaris brevis Interossei Lumbricals, Thenar (includes Abductor Pollicis Brevis, Flexor Pollicis Brevis, Opponens Pollicis) Hypothenar muscles(includes Opponens Digiti Minimi, Abductor Digiti Minimi, Flexor Digiti Minimi Brevis) Origin - Upper extremity, I - Hand and fingers Functions: Fine movements of the thumb Medially rotating and flexing the metacarpal Abducts the thumb Flexes the metacarpophalangeal (MCP) joint Rotates the metacarpal Abducts the little finger Flexes the MCP joint of the little finger