Ossification centers of the pectoral girdle
Ossification centers of the pectoral girdle can be divided into each of the three bones that form it: clavicle, scapula and proximal humerus.
Ossification centers of the clavicle
- lateral end: 5 weeks in utero
- medial end: 15 years
Ossification centers of the scapula
- body: 8 weeks in utero
- coracoid process (two centers): 12-18 months
- glenoid: 10-11 years
- inferior angle: 14-20 years (puberty)
- acromion (three centers): 14-20 years (puberty)
- medial border: 14-20 years (puberty)
Ossification centers of the proximal humerus
- diaphysis (shaft): 8 weeks in utero
- head: 1-6 months
- greater tubercle: 1 year
- lesser tubercle: 3-5 years