Final answer:
The trapezius, rhomboid major, and rhomboid minor are the primary muscles responsible for scapular adduction, also known as retraction.
Step-by-step explanation:
The muscles responsible for scapular adduction or retraction are primarily the trapezius, rhomboid major, and rhomboid minor. These muscles are located on the posterior thorax and work together to move the scapula medially towards the vertebral column. When the rhomboids contract, the scapula moves medially and allows the shoulder and upper limb to pull posteriorly.
Additionally, the trapezius muscle contributes to scapular movements including adduction, elevation, and superior rotation. The muscles responsible for scapular adduction/retraction are the rhomboid major, rhomboid minor, and trapezius muscles.
When the rhomboid muscles contract, they cause the scapula to move medially, pulling the shoulder and upper limb posteriorly and facilitating adduction and retraction movements. The trapezius muscle also plays a role in scapular adduction and retraction.