Anatomy of the Pectoralis Muscles

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Study Notes

The Pectoralis Major muscle has three heads: clavicular, sternocostal, and abdominal.
The Pectoralis Minor muscle is located beneath the Pectoralis Major.
The Clavicle and Coracoid process are important bony landmarks in the region.
The 6th rib, Sternum, and Costal Arch are also important anatomical structures in this region.

The Pectoralis Major muscle attaches to the clavicle, sternal cartilages, external abdominal oblique aponeurosis, and the crest of the greater tubercle of the humerus.
The Pectoralis Minor muscle attaches to the coracoid process.

The Pectoralis Minor muscle is responsible for depressing and protracting the scapula.
The Medial Pectoral Nerve, a branch of the Medial Cord of the Brachial Plexus, innervates both the Pectoralis Major and Minor muscles.
The Lateral Pectoral Nerve, a branch of the Lateral Cord of the Brachial Plexus, innervates the Pectoralis Major.

The Pectoralis Major and Minor muscles are closely related to the Axillary Artery, Axillary Vein, Subclavius Muscle, Clavipectoral Fascia, Deep and Superficial Fascia, Suspensory Ligament of the Axilla, and the Acromion.
The Cephalic Vein lies laterally to the Pectoralis Major.

Diagrams illustrate the intricate relationships of the Pectoralis muscles with surrounding structures like the clavicle, coracoid process, ribs, sternum, axillary artery, axillary vein, and various nerves.
The diagrams depict the insertion of the Pectoralis Major on the humerus and the attachment of the Pectoralis Minor to the coracoid process.
The diagrams also showcase the location of the Clavipectoral Fascia, 1st Costochondral Junction, and the Medial Cord of the Brachial Plexus, along with the Medial Pectoral Nerve.
The lymphatic vessels, lymphocytes, and phagocytes are shown in relation to the muscles and surrounding structures.
The diagrams provide a visual representation of the anatomical relationships between the Pectoralis Muscles and surrounding structures.