Purpose This study was designed to clarify the anatomy of the intramuscular communicating branch (ICb) between the median and ulnar nerves in the Xexor digitorum profundus (FDP), and morphologically demonstrate the location of connection. Methods Twenty Korean cadavers were dissected and a further 8 were subjected to modiWed Sihler's staining to investigate the pattern of innervation of the ICb and the location of its communicating points in muscle. Results The median and ulnar nerves divided into small branches before entering FDP muscle. Of these small branches, one or two met inside the muscle. This communicating pattern could be classiWed into three types: type I, communicating branches in both the proximal and distal regions; type II, at least one communicating branch in the proximal region; type III, at least one communicating branch in the distal region. Of 20 dissected specimens, no case of type I was observed, but 3 cases of type II and 15 cases of type III were found. No ICbs at all were found in two of the dissected specimens. In eight stained specimens, one was classiWed as type I, two as type II, and Wve as type III. The proximal communicating branches were located at 34.1% from the interepicondylar line, inside the third muscle bundle. The distal communicating branches were located at 66.0% from the interepicondylar line, between third and fourth muscle bundles. Conclusions These Wndings could provide critical anatomical information regarding the nerve distribution of FDP focused on the ICbs.
Bibliographical noteFunding Information:
Acknowledgement This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (R13-2003-013-03001-0).
All Science Journal Classification (ASJC) codes
- Pathology and Forensic Medicine
- Radiology Nuclear Medicine and imaging