shoulder & upper back
rotator cuff
The rotator cuff is a group of muscles and tendons that surrounds your shoulder. It holds your humerus (upper arm bone) in place in its socket in your scapula (shoulder blade).
deltoid
The deltoid is formed of acromial, clavicular and scapular spinal parts. Acromial part (middle fibres) abducts the arm, while the clavicular and scapular spinal parts play a significant role in stabilization, ensuring a steady plane of abduction.
trapezius
The trapezius muscle is largely involved in movements of the shoulder girdle, and is therefore functionally considered as a muscle of the upper limb rather than of the back.
rhomboids
The rhomboids are two bilateral, superficial muscles located in the upper back. They consist of two functionally similar muscles called rhomboid minor and rhomboid major.
latissimus dorsi
The latissimus dorsi muscle is the widest muscle in the human body. It is relatively thin and covers almost all back muscles at the posterior trunk, except the trapezius.
