Rotation & Ribcage
This muscle performs contralateral rotation of the trunk.
external oblique
These muscles elevate the scapula.
upper trapezius and levator scapulae
These muscles extend the shoulder
latissimus dorsi, posterior deltoid, and triceps brachii (long head)
These muscles flex the elbow.
brachialis, biceps brachii (in supination), and brachioradialis (mid-pronation/supination)
This muscle performs ipsilateral rotation of the trunk.
internal oblique
These muscles depress the scapula
lower trapezius
These muscles flex the shoulder
anterior deltoid, coracobrachialis, and biceps brachii (long head)
This muscle extends the elbow.
triceps brachii
This is the prime mover of inspiration, mainly by flattening to increase thoracic volume.
diaphragm
These muscles retract the scapula.
middle trapezius and rhomboid major & minor
These muscles abduct the shoulder.
deltoid (all fibers) and supraspinatus
This muscle pronates the forearm.
pronator teres
These muscles assist in rib elevation during inspiration along with the diaphragm.
external intercostals
This muscle protracts the scapula.
Serratus Anterior (fighters muscle "the jab")
these muscles adduct the shoulder.
latissimus dorsi, pectoralis major, and coracobrachialis
These muscles supinate the forearm
supinator and biceps brachii (when elbow is flexed)
This muscle depresses the ribs during expiration.
internal intercostals
This accessory muscle can help elevate the ribs during deep inspiration.
pectoralis minor
These muscles perform internal rotation of the shoulder.
pectoralis major, latissimus dorsi, and subscapularis
These muscles perform external rotation of the shoulder.
infraspinatus and teres minor