The deltopectoral groove is an indentation in the muscular structure between the deltoid muscle and pectoralis major.
It is the location through which the cephalic vein passes and where the coracoid process is most easily palpable.
See also Deltopectoral triangle
Additional images
References
External links Diagram at anatomyatlases.org (see #91) http://ect.downstate.edu/courseware/haonline/labs/L06/020200.htm