Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: The cadaver of a Caucasian man with a supernumerary fourth dorsal interosseous muscle in the right hand: a case report | Natsis et al. Journal of Medical Case Reports 2011 5 393 http content 5 1 393 JOURNALOF medical case reports CASE REPORT Open Access The cadaver of a Caucasian man with a supernumerary fourth dorsal interosseous muscle in the right hand a case report Konstantinos Natsis1 George Tsakotos1 Konstantinos Vlasis1 and Juergen Koebke2 Abstract Introduction The human hand is a complex anatomic entity consisting of many muscles nerves and vessels thus providing a special ability to perform accurate and meticulous movements. In this group of muscles are the four dorsal interosseous muscles. Case presentation A distinct supernumerary fourth dorsal interosseous muscle was found in the right hand of the cadaver of a 76-year-old Caucasian man without any other concomitant abnormality. Conclusions The presence of such an additional muscle in the hand should be considered in the management of hand deformities whether the treatment is conservative or surgical. Introduction The dorsal interosseous muscles of the hand arise typically by two heads from the sides of the adjacent metacarpal bones. Distally these two heads form a thin tendon and their possible insertion sites are the volar plate and the base of the proximal phalanx joint capsule extensor expansion and transverse and oblique retinacular ligaments and lateral bands of the extensor tendon. The tendon of the first and second dorsal interosseous muscles inserts at the radial aspect of the proximal phalanx of the index and median fingers respectively whereas the tendon of the third and fourth interosseous muscles inserts at the ulnar aspect of the proximal phalanx of the median and paramedian fingers respectively. In the literature many anatomic variations of these muscles have been described. Interosseous muscles may consist of one to three heads. According to Eladoumik-dachi and colleagues 1 38 of the palmar interossei and 75 of the dorsal interossei have more than one head. Specifically the .
