TEST Muscles Abbreviation

Latissimus Dorsi

A large flat muscle of the back which originates from the spine of the lower back and inserts into the humerus (q.v.) at the armpit. It adducts the upper arm, and when the elbow is abducted, it rotates the arm medially and bings the shoulder back to an anatomically neutral. It is actively used in operating equipment such as the drill press where a downward pull by the arm is required.