Origin
Scapula – inferior angle.
Insertion
Humerus – intertubercular sulcus.
Blood supply
Subscapular artery, circumflex scapular artery.
Nerve supply
Lower subscapular nerve.
Action
This muscle helps to abduct the arm inwards and to extend it behind the waist.
Disease/Injury
Excessive playing of sports or driving of heavy vehicles can cause a strain on the teres major.
Muscle Exercise
Pull-ups, shoulder rotations, and bent-over rowing help to strengthen the teres major.
Interesting fact
This is the muscle you use while tucking in your shirt into your pants.
