| Muscle | Origin | Insertion | Nerve | Action |
|---|
| Thoracohumeral muscles |
|---|
| pectoralis major | clavicle, sternum and the adjacent part 1st - 6th ribs and the aponeurosis of the external oblique muscle | intertubercular groove of the humerus | n. pectoralis lateralis + medialis | Breathing: inspiration (auxiliary). Shoulder joint: auxiliary ventral flexion and abduction, the dorsal flexion of the auxiliary, auxiliary internal rotation, adduction |
| pectoralis minor | 3rd to 5th ribs, near their costal cartilages | processus coracoideus scapulae | n. pectoralis medialis | Breathing: inspiration (auxiliary). Shoulder: auxiliary depression |
| subclavius | first rib | subclavian groove of clavicle | n. subclavius | Breathing: inspiration (auxiliary). Depression of clavicle |
| serratus anterior | 1st to 9th rib | margo medialis scapulae, angulus inferior scapulae | n. thoracicus longus | Breathing: inspiration (auxiliary). Shoulder: protraction + angulus inferior: rotation externally. Shoulder joint: abduction (just above the horizontal) |
| Autochthonous muscles |
|---|
| intercostales externi | cranial part the ribs (1 to 11) - towards the rear, from above - forward and down | caudal part the ribs (2 to 12) | nn. intercostales I.-XI. | Breathing: inspiration. Fixation ribs |
| intercostales interni | cranial part the ribs (1 to 11) - direction from the front, top - back down | caudal part the ribs (2 to 12) | nn. intercostales I.-XI. | Breathing: expiration. Fixation ribs |
| intercostales intimi | cranial part the ribs (1 to 11) - direction from the front, top - back down inside the sulcus costae | caudal part the ribs (2 to 12) | nn. intercostales I.-XI. | Breathing: expiration (auxiliary). Fixation ribs |
| subcostales | cranial part the ribs (1 to 11) - direction from the front, top - back down from the inside mm. intercostales intimi in area anguli costarum | caudal part the ribs (2 to 12) | nn. intercostales I.-XI. | Breathing: expiration (auxiliary). Fixation ribs. Sometime rudimentary |
| transversus thoracis | sternum (inner side) | cartilage 2 to 6 ribs (inner side) | nn. intercostales III. - IV | Breathing: expiration (auxiliary). |
| Diafragm |
|---|
| diaphragma - pars lumbalis | backbone, lig. arcuatum med., lig. arcuatum lat. | center tendineum | n. phrenicus | Breathing: inspiration. |
| diaphragma - pars costalis | cartilage of the ribs (7 to 12) | center tendineum | n. phrenicus | Breathing: inspiration. |
| diaphragma - pars sternalis | processus xiphoideus aponeurosis transversus abdominis | center tendineum | n. phrenicus | Breathing: inspiration. |
