A trigger point is a tight area within muscle tissue that causes pain in other parts of the body. A trigger point in the back, for example, may produce referral pain in the neck. … The results and benefits of trigger point massage are releasing constricted areas in the muscles thus alleviating pain.
Anterior part of deltoid (arises from most of the anterior border and the upper surface of the lateral third of the clavicle.) Lateral part of deltoid (arises from the superior surface of the acromion process.) Posterior part of deltoid (arises from the lower lip of the posterior border of the spine of the scapula.)