title: Extensor digitorum brevis manus with "X" tendons.
abstract: During the educational dissection of a 72-year-old Chinese male cadaver, bilateral extensor digitorum brevis manus (EDBM) muscles were observed. The left EDBM muscle originated from the joint capsule ligament, running across the second dorsal interosseous muscle as double tendons (EDBM ulnar tendon and EDBM radial tendon) on the ulnar side of extensor digitorum communis (EDC)-index finger. The EDBM radial tendon positioned ventrally but inserted further to the ulnar tendon so that they made an "X" shape. The right EDBM muscle arose from dorsal radiocarpal ligament, coursing the second dorsal interosseous muscle and inserted into the ulnar side of EDC-index finger.
authors.affiliation: Department of Neonatal Intensive Care Unit, First People-s Hospital, Jining, Shandong, China; maoqinghua629@yahoo.com.
authors.forename: Qing-hua
authors.initials: QH
authors.lastname: Mao
authors.forename: Jing
authors.initials: J
authors.lastname: Li
mesh_terms: D000368:Aged; D004210:Dissection; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000033:anatomy & histology*; D013710:Tendons / Q000033:anatomy & histology*