Pectoral muscle Mayor

MAJOR MUSCLE CHEST

SHORT DESCRIPTION

• Dorsi, flattened and triangular.
• Thin medially and laterally thick.
• It is separated from the deltoid muscle, forming the groove deltopectoral.

OCUPA

• Located on the front and upper chest.
• In front of the pectoralis minor.
• It extends from the chest to the humerus.

ORIGIN: Portion:

• Clavicular: 2/3 medial aspect of the anterior border of the clavicle. (Descending fibers)
• Sternal: corresponding half of the sternum, 5-6 first costal cartilages. 4 and 5 are most important.
• Abdominal: Front of the sheath of the rectus abdominis.

INSERTION

intertubercular anterior lip of the groove, using 2 fascicles:

• Previous: Continuation of clavicular and sternal top of the fibers.
• Rear: Formed by the other parts of the muscle.

These two issues are joined by means of a fascicle.

INNERVATION :  Nerves of the pectoralis major and minor, Brachial Plexus.

FUNCTION

• Adductor and medial rotator arm.
• fixed in the humeral point, raises the thorax. (Raising the whole body).