A second pectoral muscle, the pectoralis minor, lies beneath the pectoralis major. The pectorals are predominantly used to control the movement of the arm, with the contractions of the pectoralis major pulling on the humerus to create lateral, vertical, or rotational motion.
http://www.healthline.com/human-body-maps/pectoralis-major-muscle
The pectoralis major muscle (green highlighted on the picture) is a strong, fan-shaped muscle of the shoulder joint. It decisively shapes the surface anatomy of the breast. Furthermore it participates in forming the anterior wall of the axilla.
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Due to the different courses of the muscle fibers the insertion has a recess which is open to the top preventing the muscle from overstretching. The triangular depression between the pectoralis major muscle, deltoid muscle and clavicle is called infraclavicular fossa (Mohrenheim’s fossa). Here the cephalic vein passes through in the subfascia within the deltopectoral groove.
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The development of intensive care units has sharply improved the care of the post-thoracotomy patient. The availability of monitors, ventilators, and special assist devices has increased not only the safety of the operation but also the comfort of the patient.
http://medical-dictionary.thefreedictionary.com/pectoralis
[pek′tərā′lis, pek′tərəlis′]. Etymology: L, pectus, breast. a large muscle of the upper chest wall that acts on the joint of the shoulder. Thick and fan-shaped, it arises from the clavicle, the sternum, the cartilages of the second to the sixth ribs, and the aponeurosis of the obliquus externus abdominis. It serves to flex, adduct, and medially rotate the arm in the shoulder joint.
http://medical-dictionary.thefreedictionary.com/pectoralis+major
pectoralis major. A large triangular muscle that extends from the sternum to the humerus and functions to flex, horizontally adduct, and internally rotate the arm, and aids in chest expansion when the upper extremities are stabilized.
http://medical-dictionary.thefreedictionary.com/pectoralis
thoracic surgery surgical procedures involving entrance into the chest cavity. Until techniques for endotracheal anesthesia were perfected, this type of surgery was extremely dangerous because of the possibility of lung collapse.
http://medical-dictionary.thefreedictionary.com/pectoralis
As the operative site heals and the lung expands, the chest tubes can be safely removed. After their removal an airtight bandage is applied to the area. As a precaution against leakage of air into the chest cavity, the physician may apply petrolatum to the edges of the wound before applying the dressing.
http://medical-dictionary.thefreedictionary.com/pectoralis
Pectoralis major. The pectoralis major muscle is a large muscle in the upper chest, fanning across the chest from the shoulder to the breastbone. The two pectoralis major muscles, commonly referred to as the pecs, are the muscles that create the bulk of the chest. A developed pectoralis major is most evident in males, as the breasts of a female typically hide the pectoral muscles.
http://www.healthline.com/human-body-maps/pectoralis-major-muscle
Function. The pectoralis major muscle is the most important muscle for the adduction and anteversion of the shoulder joint which is why it is also known as the “breaststroke muscle”. It rotates the upper arm outwards and makes a powerful stroke movement (retroversion) when the arms are elevated (e.g. in wood-chopping).
https://www.kenhub.com/en/library/anatomy/major-pectoralis-muscle
pectoralis major definition
The pectoralis major muscle is a large muscle in the upper chest, fanning across the chest from the shoulder to the breastbone.