Anatomy Doubt..!

[smyle32]

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This is from decks..which muscle assists in extension adduction and medially rotates upper arm?
pectoralis major
lattissimus dorsi
deltoid
teres major
teres minor
ans: teres major

i want to know why it is not latissimus dorsi,even that has got the same functions.does anyone know?

 

[btizzels]

According to my book (Human Anatomy, Mckinley) you are right, that the Teres Major and the Lat Dorsi, preform the same functions... so my guess is that the Decks are just dumb