Where does the rhomboid major muscle insert?

The rhomboid major muscle inserts on the medial border of the scapula. This is significant because the primary function of the rhomboid major is to retract the scapula, pulling it towards the spine, which is crucial for various movements of the shoulder girdle and upper limb stability.

Understanding the anatomical location of this muscle is essential for recognizing its role in activities that involve the upper back, such as rowing or pulling movements. Its insertion on the medial border allows it to effectively assist in maintaining proper posture and aiding in the stabilization of the shoulder during dynamic actions.

In contrast, the other options refer to different anatomical structures that are not associated with the rhomboid major's insertion, which further highlights the correctness of the first choice in identifying where this muscle attaches.