What is the proximal attachment of the rhomboid major?

The rhomboid major muscle is primarily responsible for retracting the scapula and stabilizing it against the thoracic wall. The correct attachment point, the spinous processes of the thoracic vertebrae from T2 to T5, indicates the muscle’s origin on the thoracic spine. This area is specifically where the rhomboid major originates, enabling it to connect effectively to the scapula and perform its role in scapular movement.

Understanding the anatomical landmarks in relation to the spinal vertebrae is crucial for comprehending how the rhomboid major functions. The specific attachment at the T2 to T5 spinous processes helps clarify its role in posture and shoulder function, as it allows the muscle to exert force on the scapula which is positioned laterally.

The other options refer to cervical and various thoracic vertebral regions that do not correspond to the actual anatomy of the rhomboid major, thereby affirming that the thoracic spine from T2 to T5 is indeed the correct origin for this essential muscle.