The clavicle is the last bone to fully develop in the shoulder region. Which statement is true regarding clavicle development?

• A. It is the first bone to begin ossification
• B. It is the last to complete ossification
• C. It does not ossify until adulthood
• D. It ossifies from the end of the spine

Answer: (B)

Ossification timing for the clavicle has a distinctive pattern: it begins early in fetal life with a primary center forming in the clavicle, so this bone is among the first to start ossifying. However, the ends of the clavicle develop later, with secondary ossification centers appearing during adolescence at the medial (sternal) and lateral (acromial) ends. These end centers fuse with the shaft in late adolescence to early adulthood, meaning the clavicle is the last bone to complete its ossification. That makes the true statement that it is the last to complete ossification. The other options conflict with this timeline: ossification starts long before adulthood, and it begins centrally rather than at the end.