FIG 8. Retropectoralis minor space (cords).

A, Position of the probe to explore the brachial plexus at the retropectoralis minor space.

B, Sonogram (90° left rotated) in a 31-year-old female volunteer shows the nerve cords of the brachial plexus at the retropectoralis minor space.

C, Sagittal gross oblique anatomic section of the retropectoralis minor space.

In B and/or C, 1 indicates pectoralis minor muscle; 2, pectoralis major muscle; 3, axillary artery; 4, axillary vein; 5, posterior nerve cord; 6, lateral nerve cord; 7, medial nerve cord; S, skin.