The anterior, posterior, and lateral chest areas. Anterior divisions (right and left) are the clavicular, infraclavicular, and supraclavicular, the mammary and inframammary, and the upper and lower sternal. Posterior divisions (right and left) are the scapular, infra-scapular, inter-scapular, and suprascapular. Lateral divisions are the axillary and infra-axillary.