innervated by innervated_by has muscle origin has muscle origin has muscle insertion has muscle insertion Homo sapiens radial nerve extensor carpi radialis longus muscle http://upload.wikimedia.org/wikipedia/commons/7/75/ECR-longus.png FMA:38494 UMLS:C0224266 UBERON:0001524 extensor carpi radialis longus Wikipedia:Extensor_carpi_radialis_longus_muscle MA:0002291 SCTID:244990000 Extensor carpi radialis longus is one of the five main muscles that control movements at the wrist. This muscle is quite long, starting on the lateral side of the humerus, and attaching to the base of the second metacarpal bone (metacarpal of the index finger). [WP,unvetted]. musculus extensor carpi radialis longus NCIT:C52913 EMAPA:36189 metacarpal bone of digit 2 distal epiphysis of humerus extensor carpi radialis muscle