Which bone of the shoulder region is the last of the skeletal system to completely develop?

• A. Clavicle
• B. Scapula
• C. Humerus
• D. Radius

Answer: (A)

Growth and development of the shoulder bones hinge on how and when their growth plates fuse. The clavicle is unique here: it starts ossifying very early in fetal life, but its ends have secondary ossification centers that appear later and fuse much later than the others. That late epiphyseal fusion means the clavicle keeps growing longer into late adolescence or early adulthood, more so than the humerus, scapula, or radius. So, among these bones, the clavicle is the last to complete its development.

The other bones tend to finish growing earlier because their growth plates fuse earlier in adolescence, whereas the clavicle’s fusion—especially at the medial end—occurs much later.