What is the somewhat wider portion of a long bone adjacent to the epiphyseal plate called?

• A. Diaphysis
• B. Metaphysis
• C. Endosteum
• D. Medullary cavity

Answer: (B)

The somewhat wider portion of a long bone adjacent to the epiphyseal plate is known as the metaphysis. This area is significant because it connects the epiphysis, which is the end part of a long bone, to the diaphysis, which is the central shaft of the bone. The metaphysis plays a crucial role in the growth and development of the bone during childhood and adolescence, as it is where the epiphyseal plate (or growth plate) is located.

During periods of bone growth, this plate facilitates the formation of new bone tissue, allowing for an increase in the length of the bone. As development continues, the epiphyseal plate eventually ossifies and becomes the epiphyseal line, but until that process is complete, the metaphysis remains an important region for growth. This anatomical feature is crucial for understanding skeletal development and changes that occur as a person matures.