What are the secondary centers of ossification referred to as?

• A. Diaphysis
• B. Epiphysis
• C. Metaphysis
• D. Cortex

Answer: (B)

The secondary centers of ossification are referred to as epiphyses. These areas are located at the ends of long bones and are critical for the growth and development of the skeletal system. During the process of endochondral ossification, which is how long bones grow, these secondary ossification centers develop after birth, allowing for the formation of the articular surfaces of the bones where they connect with other bones at joints.

The epiphyses are distinct from the primary ossification center, which occurs in the diaphysis, or the shaft of the bone. The diaphysis is where the primary ossification occurs first during fetal development, leading to the formation of the bone's structure. The metaphysis is the region between the diaphysis and epiphysis that plays an important role during growth, particularly at the growth plate, and the cortex refers to the outer layer of the bone structure, playing a role in the support and protection of the inner bone material. Thus, the term 'epiphysis' specifically identifies the location and function of secondary ossification centers effectively.