Anatomy of the Pectoralis Muscles PDF

# Pectoralis Muscles The document describes the anatomy of the pectoralis muscles, which are located in the chest. ### Anatomy of the Pectoralis Major - **Pectoralis major** muscle: - Clavicular head - Sternocostal head - Abdominal head - **Subclavius** muscle - **Clavicle** - **Corac...

# Pectoralis Muscles The document describes the anatomy of the pectoralis muscles, which are located in the chest. ### Anatomy of the Pectoralis Major - **Pectoralis major** muscle: - Clavicular head - Sternocostal head - Abdominal head - **Subclavius** muscle - **Clavicle** - **Coracoid process** - **Pectoralis minor** muscle - **6th rib** - **Sternum** - **Costal arch** - **Crest of greater tubercle (lateral lip of intertubercula groove)** ### Attachments of Pectoralis major - **Pectoralis major** muscle: - Deltoid muscle - **Cephalic vein** - **Clavicular head** - **Sternocostal head** - **Sternal cartilages** - **External abdominal oblique aponeurosis** - **Pectoralis minor** muscle - **Stermontal bend** ### Function of Pectoralis Minor and Medial pectoral nerve - **Lateral pectoral nerve**: - **Lat. cord of brachial plexus** - **Axillary artery** - **Suspensory ligament axilla** - **Coracoid process** - **Subclavius muscle** ### Attachments of Pectoralis Major - **1st costochondral junction** - **Clavipectoral fascia** - **medial cord of brachial plexus** - **medial pectoral nerve** - **pectoralis minor muscle** ### The relationship of pectoralis muscles with surrounding structures. - **Pectoralis major** - **Axillary vein** - **Subclavius muscle** - **Clavipectoral fascia** - **Pectoralis minor** - **Deep (axillary) fascia** - **Superficial fascia** - **Suspensory ligament of axilla** - **Acromion** ### A diagram of the pectoralis major muscle (Diagram 1) - The diagram shows the pectoralis major muscle with its three heads: clavicular, sternocostal, and abdominal. - The diagram also shows the subclavius muscle and the coracoid process. - The location of the 6th rib, sternum, and costal arch are easily understood. ### A diagram of the pectoralis major muscle (Diagram 2) - The diagram shows the pectoralis major muscle with its 3 heads: clavicular, sternocostal, and abdominal. - The diagram also shows the pectoralis minor muscle, the subclavius muscle, the clavicle, the coracoid process, and the axillary artery. - The diagram shows the connection of the muscles to the ribcage and the scapula. ### A diagram of the pectoralis major muscle (Diagram 3) - The diagram shows the pectoralis minor muscle and its connection to the coracoid process and the scapula. - It also shows the location of the lateral pectoral nerve, which is the nerve responsible for innervating the pectoralis major muscle. - This diagram illustrates the relationships of the pectoralis muscles to the axillary artery, the axillary vein, the subclavius muscle, and the clavicle. ### A diagram of the pectoralis major muscle (Diagram 4) - The diagram shows the relationship of the muscles and nerves deep to the pectoralis major and minor. - It shows the lateral pectoral nerve, the medial pectoral nerve, and the location of the clavipectoral fascia, as well as showing the insertion (the point where the pectoralis major connects to the humerus) and location of the pectoralis minor muscle. - It also shows the 1st costochondral junction, the medial cord of the brachial plexus, and the medial pectoral nerve. ### A diagram of the pectoralis major muscle (Diagram 5) - This diagram shows the location of the cephalic vein, which runs along the lateral side of the pectoralis major muscle. The diagram also shows the location of the pectoralis major and minor muscles, as well as the subclavius muscle, the clavicle, and the coracoid process. - It also shows the axillary vein’s location running medially alongside the lateral pectoral nerve, as well as the suspensory ligament of the axilla. - It also shows the location of the clavicle and the coracoid process. ### A diagram of the pectoralis major muscle (Diagram 6) - This diagram shows the lymphatic vessel, lymphocytes, and phagocytosis in relation to the pectoralis major and minor muscles, the subclavius muscles, and the clavicle. - It also shows the relationship of the axillary artery and vein. It shows the location of the cephalic vein running alongside the lateral pectoral nerve and the suspensory ligament of the axilla. - It also shows the location of the clavicle and the coracoid process. ### A diagram of the pectoralis major muscle (Diagram 7) - This diagram shows the location of the cephalic vein and its location in relation to the pectoralis major muscle, the subclavius muscle, and the clavicle. - It also shows the axillary vein and the suspensory ligament of the axilla. ### Diagram of the pectoralis major muscle (Diagram 8) - This diagram shows the location of the acromiothoracic artery and cephalic vein. This diagram illustrates the position of the pectoralis minor muscles, the clavicle, the clavipectoral fascia, and the lateral pectoral nerve. The suspensory ligament of the axilla and the subclavius muscle are also shown. - The diagram shows the location of the axillary vein. It also shows the relationships of the pectoralis minor, clavicle, coracoid process, and suspensory ligament of the axilla. ### Pectoralis Muscle Movements - **Elevation** - **Depression** - **Protraction** - **Retraction** - **Upward rotation** - **Downward rotation** ### Conclusion This document describes the anatomy of the pectoralis muscles, including their attachments and movements. It also provides diagrams of the muscles and their relationships to surrounding structures.