Identify the muscles that act on the scapular girdle in the figure below:
Trapezius muscle
Serratus anterior muscle
Rhomboid major muscle
Rhomboid minor muscle
Trapezius muscle: elevates or depresses the scapula and is innervated by the accessory nerve and the third and fourth cervical nerves.
Serratus anterior muscle: protracts the scapula and is innervated by the long thoracic nerve.
Rhomboid major muscle: retracts, rotates, and fixes the scapula and is innervated by the dorsal scapular nerve.
Rhomboid minor muscle: retracts, rotates, and fixes the scapula and is innervated by the dorsal scapular nerve.