Pectoral girdle myalgia in women: a new function for pectoralis major?

Brassière straps transfer breast weight from pectoral fascia to the shoulder region where upper trapezius supports it. It is apparent that upper trapezius also has a posterior component because of its enthesis from the vertebral spines. Contraction of upper trapezius should, therefore, cause retraction of the pectoral girdle over the thorax; but this… CONTINUE READING