What is the end of a long bone called?

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

Answer: (B)

The ends of a long bone are called the epiphyses. These regions form the joint surfaces with neighboring bones and house spongy bone, often with red marrow. In growing individuals, the epiphyses are separated from the shaft (diaphysis) by the metaphysis, where the growth plate sits; when growth stops, the growth plate ossifies. The diaphysis is the long central shaft, the metaphysis is the transitional zone between shaft and ends, and the periosteum is the outer fibrous membrane covering most of the bone.