<prompt> All the muscles are used to abduct the shoulder except -DeltoidSupraspinatusSerratus anteriorPectoralis major  <response>: Muscles responsible for abduction of the shoulder joint- Supraspinatus- first 15 degrees of abduction- Deltoid Acromial fibers- it is responsible for abduction from 15 to 90 degrees.- Trapezius and serratus anterior- They are responsible for upward rotation of the glenoid cavity. 