Extensor Carpi Radialis Longus 2nd and 3rd metacarpals Write these down in your notes and study them. There will be a quiz over them on Friday. Muscles of the Forearm Origin Insertion Action *Brachioradialis Humerus Radius Supinates Paw Extensor Carpi Radialis Longus 2nd and 3rd metacarpals Extends and flexes wrist Extensor Carpi Radialis Brevis 3rd metacarpal Extends and abducts hand Extensor Digitorum Communis Phalanges of digits 2-5 Extends digits 2-5 Extensor Digitorum Lateralis Phalanges of digits 3-5 Extends digits 3-5 Extensor Carpi Ulnaris 5th Metacarpal Extends and rotates wrist Flexor Carpi Ulnaris Humerus and Ulna Carpals Flexes Wrist Flexor Carpi Radialis Ulna Pisiform Flexes wrist Palmaris Longus Palmar Aponeurosis * Will be on the muscle identification portion of the test