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Of these there are several. The common interosseons artery arises from the posterior part of the ulnar, a little below the bicipital tuberosity of the radius; passes backwards and divides into two branches: the one called anterior interosseous descends vertically, anterior to the interosseous ligament; the other, called posterior interosseous, passes above the ligament, appears at its posterior part and divides into two great branches, - the posterior recurrent radial and the posterior interosseous, properly so called. In the hand, - 1. The dorsal metacarpal interosseous arteries are given off by the dorsalis carpi, a division of the radial artery. 2. The palmar interosseous arteries, which arise from the convexity of the deep palmar arch, and give off the middle interosseous arteries. 3. The dorsal interosseous of the index, proceeding directly from the radial artery. In the foot, are distinguished: - 1. The dorsal interosseous arteries, three in number, which arise from the artery of the metatarsus, a branch of the dorsalis tarsi. 2. The plantar interosseous arteries, which are, also, three in number, and arise from the plantar arch.