There are five muscles that make their origin or insertion on the clavicle: pectoralis major and sternocleidomastoid muscles medially; subclavius muscle centrally; and deltoid and trapezius muscles distally (Gray, 1918; Netter, 1987).Click to see full answer. Also asked, what muscles insert on the clavicle? Three muscles are attached to the medial third of the clavicle: The sternocleidomastoid muscle, where the muscular clavicular head of the muscle is attached to the superior surface of the bone. The pectoralis major muscle, which is attached to the anterior surface of the bone. Likewise, what is the muscle above my collarbone called? Pectoralis major: This large fan-shaped muscle stretches from the armpit up to the collarbone and down across the lower chest region. It connects to the sternum (breastbone). Consequently, are there muscles around the collar bone? The pectoralis major covers the top half of your chest. It is mostly an arm mover, although it also stabilizes the joint between your sternum and collar bone. It is the hugging muscle: it powerfully pulls and rotates the arms towards the center of your body. Like all the big flexors, it’s crazy strong.Where is the clavicle in your body?The clavicle is located between the ribcage (sternum) and the shoulder blade (scapula). It is the bone that connects the arm to the body. The clavicle lies above several important nerves and blood vessels.