<prompt> Which muscle is inseed into the floor of the inteubercular sulcus ?Lattissimus dorsiTeres majorLong head of bicepsDeltoid  <response>: Lattissimus dorsi is inseed into the floor of the inteubercular sulcus Inteubercular sulcus lies between the greater and lesser tubercles. Ref: Grays Anatomy The Anatomical Basics of Clinical Practice 41 e pg 806. 