In dogs, the shoulder is stabilized by the subscapularis, supraspinatus, teres minor, infraspinatus muscles as well as the biceps tendon, medial and lateral ligaments. (orthopets.com)
• This movement is therefore great for the entire shoulder region and particularly the delts, whilst the teres major and infraspinatus work almost as hard. (anabolicsmall.com)
Like the teres minor and infraspinatus muscle, the subscapularis also helps you rotate your arm and shoulder around. (bodybuilding-wizard.com)