The sternalis muscle is a little known muscle located at the sternum. This muscle seems to be vestigial in that it doesn’t have a known function. In originates on the superior portion of the sternum and the upper part of the pectoralis muscle. It’s insertion is the cartilage of ribs 3-7, or sometimes the sheath of the rectus abdominis, or the lower part of pectoralis major. Even though this muscle doesn’t seem to have a purpose anymore it can still harbour trigger points. These points will cause pain to be felt intensely deep in the sternum, with spillover pain radiating down the inside of the arm.
Myofascial trigger points in the neck muscles are one of the most common causes of neck pain and stiffness. Poor posture and stress can cause muscles in the neck to become overworked and strained. When this happens trigger points will form. These points of contracted muscle will cause pain, referred pain (often into the head), as well as stiffness and weakness. Trigger points won’t resolve on there own, a manual release such as trigger point massage is required to treat the problem.
Trigger points in a number of muscles can refer pain into the head causing headaches. One of the most common muscles is the trapezius. This is a large diamond shaped muscle in the upper back and neck. Trigger points in the upper portion of this muscle are the most common trigger points in the body. These points will refer pain into the head, behind the ear and into the temple. Trigger points usually won’t resolve on their own, a therapeutic intervention is required to release the point.
this is a great a great chart showing the physiology of a myofascial trigger point. To learn more about trigger points visit http://www.triggerpointmassagetherapy.info