Which muscles make up the shoulder girdle?

The shoulder girdle consists of a group of muscles that are crucial for the movement of the shoulders and stability of the scapula. The trapezius, rhomboids, serratus anterior, and levator scapulae are specifically involved in various movements such as elevation, retraction, and rotation of the shoulder blade (scapula), which supports the upper limb's function.

The trapezius muscle is large and covers the upper back, providing stability and helping to maintain good posture, as well as facilitating shoulder movements. The rhomboids play a key role in retracting the scapula, bringing the shoulder blades closer to the spine. The serratus anterior is essential for scapular protraction and upward rotation, allowing for overhead arm movements. Lastly, the levator scapulae assists in elevating the scapula and is also involved in the flexion of the neck.

The other muscle groups listed in the incorrect options do not form part of the shoulder girdle. The deltoids and pectorals are primarily involved in shoulder joint movements rather than stabilizing the girdle itself. The latissimus dorsi and teres major primarily function at the shoulder joint for movements of the arm, while the biceps brachii