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MUSCOLI DELLA PARETE TORACICA IN ORDINE ALFABETICO

Muscles of the Thoracic Region - Listed Alphabetically

Muscle Origin Insertion Action Innervation Artery Notes
diaphragm xiphoid process, costal margin, fascia over the quadratus lumborum and psoas major mm.(lateral & medial arcuate ligaments), vertebral bodies L1-L3 central tendon of the diaphragm pushes the abdominal viscera inferiorly, increasing the volume of the thoracic cavity (inspiration) phrenic nerve (C3-C5) musculophrenic a., superior phrenic a., inferior phrenic a. left crus attaches to the L1-L2 vertebral bodies, the right crus attaches to the L1-L3 vertebral bodies
external intercostal lower border of a rib within an intercostal space upper border of the rib below, coursing, downward and medially keeps the intercostal space from blowing out or sucking in during respiration intercostal nerves (T1-T11) intercostal a. 11 in number; they extend from the tubercle of the rib to the costochondral junction; continuous with the external intercostal membrane anteriorly
innermost intercostal upper borders of a rib fibers course up and medially to insert on the inferior margin of the rib above keeps the intercostal space from blowing out or sucking in during respiration intercostal nerves (T1-T11) intercostal a. innermost intercostal mm. have the same fiber direction as the internal intercostal mm., the only difference being that they lie deep to the intercostal neurovascular bundle
internal intercostal upper border of a rib lower border of rib above, coursing up and medially keeps the intercostal space from blowing out or sucking in during respiration intercostal nerves (T1-T11) intercostal a. 11 in number; they extend from the margin of the sternum to the angle of the rib; continuous posteriorly with the internal intercostal membrane
levatores costarum transverse processes C7-T11 rib below its origin, medial to the angle elevates the rib dorsal primary rami of spinal nerves C7-T11 deep cervical a., intercostal aa. these are fairly small and insignificant muscles
subcostalis angle of ribs angle of a rib 2-3 ribs above origin compresses the intercostal spaces intercostal nerves intercostal a. subcostalis, transversus thoracis & innermost intercostal mm. make up the deepest intercostal muscle layer
transversus thoracis posterior surface of the sternum inner surfaces of costal cartilages 2-6 compresses the thorax for forced expiration intercostal nerves 2-6 internal thoracic a. transversus thoracis, subcostalis & innermost intercostal mm. make up the innermost intercostal muscle layer

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