From the

conoid tubercle The clavicle, or collarbone, is a slender, S-shaped long bone approximately 6 inches (15 cm) long that serves as a strut between the shoulder blade and the sternum (breastbone). There are two clavicles, one on the left and one on the right ...

an oblique ridge, the trapezoid line (or trapezoid ridge, or oblique), runs forward and lateralward, and affords attachment to the

trapezoid ligament The trapezoid ligament is a ligament connecting the coracoid process of the scapula (the shoulder blade) to the trapezoid line of the clavicle (collarbone). It is an anterior and lateral fasciculus, and is broad, thin, and quadrilateral. Its ant ...

on inferior surface of clavicle

References

Clavicle {{musculoskeletal-stub