Clavicular Head of the Pectoralis Major

Composing the top region of the chest, the clavicular head is one of two  heads which comprises the prectoralis major muscles, which composes the main  mass of the chest region.

Being greatly recruited during abduction and transverse flexion of the  shoulder, the clavicular head is stimulated during many bench pressing and  fly exercises, and usually targeted with these exercises. Being also  recruited during shoulder abduction, and flexion to a degree, the clavicular  head will receive some stress from front deltoid isolation exercises,  specifically front raises.

When training for muscular size it is often best to train in a rep range of  6-12 repetitions, although there is often much debate on the optimal rep  range. It would be advisable to experiment with different ranges to see  which suits you.

Clavicular Head courtesy of Fitness Uncovered - Bodybuilding & Fitness

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