Figure 1From: Biceps sternalis: a Y-shaped muscle on the anterior chest wall The photograph shows the bicipital sternalis muscle (BSM) and the pectoralis inferior muscle (PIM) on the right side. SCMM: sternocleidomastoid muscle, PMM: pectoralis major muscle, CM: costal margin, ICN: intercostal nerve, AEOM: abdominal external oblique muscle, RAM: rectus abdominis muscle.Back to article page