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The Martin-Gruber Anastomosis (or Martin-Gruber Connection) is a communicating nerve branch between the median nerve and the ulnar nerve in the forearm. It is the most common anastomotic anomaly that occurs between these two nerves. This connection carries motor nerve fibers. In cases of nerve lesions of the median or ulnar nerves the MGA can serve as a conduit for alternative innervation of portions of the forearm or hand. This inconstant pattern of connection can serve as explanation for a difficult or challenging differential diagnosis. In one study, the MGA was found in 22.9% of cadaver specimens. This relatively high incidence demonstrates the necessity for healthcare specialists to factor the MGA into their diagnoses. Discussion:. - motor nerve may cross over from the median to ulnar nerve in the forearm; (motor connections but not sensory connections); - it occurs in two patterns: - from median nerve in proximal forearm to ulnar nerve in middle to distal third of forearm, & from AIN to ulnar nerve; - other anastomoses between median nerve & ulnar nerve includes: - motor branch of median nerve to superficial head of FPB & ulnar nerve to the deep head of the FPB; - anastomosis, of median nerve & ulnar motor branches thru first lumbrical or thru innervation of & adductor pollicis; - branch of median nerve to third lumbrical joining neural branch to this muscle from deep branch of ulnar nerve; - median nerve may also form anastomoses w/ branch of radial nerve in vicinity of apb & have radial nerve innervate this muscle; - first dorsal interosseous, adductor pollicis, or even abductor digiti minimi may be innervated by the median nerve ==References== * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Martin-Gruber Anastomosis」の詳細全文を読む スポンサード リンク
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