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Thoracic Region
Stack #64410
Muscle | Attachment | Innervation | Main Action(s) |
---|---|---|---|
Pectoralis Major Muscle - Clavicular Head | Medial 1/2 of clavicle, sternoclavicular joint | Lateral Pectoral Nerve | Flexion, Adduction of humerous at shoulder |
Pectoralis Major Muscle - Sternocostal Head | Sternum to 7th rib, sternoclavicular joint | Lateral AND Medial Pectoral Nerve | Flexion, Adduction of humerous |
Pectoralis Minor Muscle | Anterior surface of 3rd, 4th and 5th ribs, Coracoid process of scapula | Medial Pectoral Nerve | Aids in rib elevation |
Subclavius Muscle | 1st rib, clavicle | Subclavian branch of brachial plexus | Depresses clavicle |
Serratus Anterior Muscle | Upper 8 ribs, Deep medial border of scapula | Long Thoracic Nerve | Protracts scapula and rotates it upward |
External Intercostals | Between ribs | Corresponding intercostal nerves | Respiratory muscle |
Internal Intercostals | Between ribs | Corresponding intercostal nerves | Depress ribs during expiration |
Levator Costarum Muscle | Transverse processes, ribs | Corresponding thoracic dorsal rami | Raises ribcage |