Fig. 4

a–b. For exposure of the midshaft, only a portion of the approach is needed following the line of the lateral border of the biceps muscle (hatched area) (a). The biceps muscle is retracted medially, and the anterior aspect of the brachialis muscle is exposed. Dissection of the M. brachialis is performed to expose the bone (dashed line) (b). 1 Brachial muscle; 2 Biceps muscle of the arm; 3 Dissection of brachial muscle (dashed line); 4 Humerus; 5 Deltoid muscle