- Discussion:
- major internal rotators are
teres major, ,
latissimus,
pect major;
- latissimus dorsi & teres major insert along medial lip of bicipital groove &
pectoralis major along lateral lip and also serve as internal rotators;
- these muscles comprise larger mass than those that
externally rotate the
humerus which explains greater power of internal rotation;
- internal rotators are supplied by nerves which arise directly from
the
brachial plexus; 
