Muscle
Teres major
"Lat's little helper"
High-yield
Not a rotator cuff muscle; forms the lower border of the quadrangular/triangular spaces. Lower subscapular nerve.
Overview
A thick muscle at the inferolateral scapula that assists latissimus dorsi in adduction and medial rotation of the arm.
Reference facts
- Origin
Posterior surface of the inferior angle of the scapula
- Insertion
Medial lip of the intertubercular groove of the humerus
- Action
Adducts and medially rotates the arm
- Innervation
Lower subscapular nerve (C5, C6)
- Blood supply
Subscapular / circumflex scapular arteries