Musculos torax

Muscle | Origin | Insertion | Action | Innervation | Artery | Notes | Image |
intercostal:external | 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 therib to the costochondral junction; continuous with the external intercostal membrane anteriorly | |
intercostal:innermost | upper border of a rib | lower border of rib above, coursing up andmedially | 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 theinternal intercostal mm., the only difference being that they lie deep to the intercostal neurovascular bundle | |
intercostal: internal | upper border of a rib | lower border of rib above, coursing upand 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 sternumto 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 therib | 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 ribsbelow origin | depress the ribs | 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 | draws down costal cartilages | intercostal nerves 2-6 | internal thoracic a. | transversus thoracis,...