Pectoralis minor is a fan-shaped muscle in the front of the shoulder that secures the lateral angle of the scapula to the rib cage. Superficially, it is covered by the pectoralis major. Studies for breast implants reveal varying space between these two muscles and their attachments. Superiorly, it blends into the clavipectoral membrane, which forms a sheet that continues superiorly to subclavius and covers the thoracic bundle.
Origin – coracoid process of the scapula
Insertion – ribs 3-5. dissection show that it commonly attaches to the second rib and, occasionally attaches to the 6th rib.
Function – protracts the scapula from the lateral angle, assists in labored breathing
Tony Preston has a practice in Atlanta, Georgia where he sees clients.
He has written and taught about anatomy, trigger points and cranial therapies since the mid-90s.