The chest muscles are made up of the pectoralis major and, u..
Added 2023-07-31 02:45:29 +0000 UTCThe chest muscles are made up of the pectoralis major and, underneath that, the pectoralis minor. Together they are often referred to as the "pecs." The pectoralis major is the larger muscle and has two parts. An upper portion called the clavicular head and the lower portion called the sternal head.
