<prompt> Which of the following muscle is not in the pectoral region?Pectoralis majorInfraspinatusPectoralis minorSubclavius  <response>: Muscles of pectoral region:- Pectoralis major , pectoralis minor , subclavius and serratus anterior. Largest muscle of pectoral region- pectorals major. Key muscle- pectoralis minor. Infraspinatus- muscle of scapular region. Reference: vishram singh, page no.40, chapter 3 