正中動脈と正中神経，前骨間神経走行との関係について

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  • Relationship of Median Artery to Median Nerve and Anterior Interosseous Nerve.

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Both arms of fifty embalmed cadavers were evaluated for the following three variables; (1) The presence of the median artery, which was classified as two types: the palmar and antebrachial type after Rodriguez-Niedenfuhr. (2) The origin of the median artery. (3) The relations between the median artery and median and anterior interosseous nerve.<br>The median artery was found in 98 (98%) of the 100 arms. The median artery terminates in the forearm within the median nerve or within the flexor digitorum superficialis, flexor digitorum profundus in 98 of the cases. The palmar type was not seen.<br>The origin of the median artery was most frequently from the anterior interosseous artery (33%) and it was following from the common interosseous artery (24%), from the ulnar artery (22%) at the caudal angle between the ulnar artery and common interosseous artery (20%) and from the radial artery (1%).<br>The median artery coursed distally to lie at the radial side of the median nerve in 95 cases (97%). Piercing of the median or anterior interosseous nerve by the median artery in the forearm was seen in three cases (3%).<br>The median artery was intimately related with the anterior interosseous nerve. The anatomical relationship consisted of crossing in front of the nerve in 79 cases (80.6%), behind it in 10 cases (10.2%), between the branches of the nerve in 8 cases (8.2%) and the artery pierced the nerve in one case (1%).<br>As a result, we believe the following conditions may increase the risk of median and anterior interosseous nerve compression.; (1) When the median artery pierces the median, anterior interosseous nerve or both, (2) When the median artery passes between the branches of the anterior interosseous nerve, and (3) When the anterior interosseous nerve passes between the median and ulnar artery.

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