MUSCLES OF ORIGIN INSERTION ACTION NERVE THORACIC WALL Diaphragm Internal surfaces of xiphoid process and Centra tendon of the diaphragm Increases volume of thoracic cavity by Phrenic nerves inferior 6 ribs; anterior surfaces of pulling central tendon inferiorly (C3-C5) vertebrae L1, L2 and L3 External intercostals Inferior border of rib above Superior border of rib below Elevates rib cage during normal Intercostal inspiration Internal intercostals Superior border of rib below Inferior border of rib Depresses rib cage during forced Intercostal expiration Pectoralis major Medial half of clavicle, sternum, costal Lateral lip of intertubercular groove Flexion, medial rotation and adduction Lateral and cartilages, aponeurosis of external of humerus of the arm medial pectoral abdominal oblique Pectoralis Anterior surface of ribs 3 to 5 Coracoid process of scapula Depression and inferior rotation of Medial pectoral scapula MUSCLES OF THE ORIGIN INSERTION ACTION NERVE ANTERIOR ABDOMINAL WALL
MUSCLES OF THORACIC WALL ORIGIN INSERTION ACTION NERVE Diaphragm Internal surfaces of xiphoid process and inferior 6 ribs; anterior surfaces of vertebrae L1, L2 and L3 Centra tendon of the diaphragm Increases volume of thoracic cavity by pulling central tendon inferiorly Phrenic nerves (C3-C5) External intercostals Inferior border of rib above Superior border of rib below Elevates rib cage during normal inspiration Intercostal Internal intercostals Superior border of rib below Inferior border of rib Depresses rib cage during forced expiration Intercostal Pectoralis major Medial half of clavicle, sternum, costal cartilages, aponeurosis of external abdominal oblique Lateral lip of intertubercular groove of humerus Flexion, medial rotation and adduction of the arm Lateral and medial pectoral Pectoralis Anterior surface of ribs 3 to 5 Coracoid process of scapula Depression and inferior rotation of scapula Medial pectoral MUSCLES OF THE ANTERIOR ABDOMINAL WALL ORIGIN INSERTION ACTION NERVE
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