Muscle most commonly affected by congenital absence is?
Pectoralis major
Semi membranosus
Teres minor
Gluteus maximus
Pectoralis major and minor muscles are the most common congenitally absent muscles in humans. Ref: Ultrasound of the Musculoskeletal System, 2007, Pages 51, 285; Principles of Neurology By Allan H. Ropper, Raymond Delacy Adams, Maurice Victor, Robe H. Brown, Page 1245; Clinical Pediatric Urology By A. Barry Belman, Lowell R. King, Stephen Alan Kramer, Page 947