What is the diaphysis?

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Multiple Choice

What is the diaphysis?

Explanation:
The diaphysis is the shaft of a long bone—the elongated central portion that runs between the two ends. It’s typically composed of dense cortical bone surrounding a medullary cavity that contains bone marrow. The ends of the bone are the epiphyses, where spongy bone and the joint surfaces (articular cartilage) reside. In children, growth occurs at the growth plate (epiphyseal plate) near where the shaft meets the ends. So the diaphysis specifically refers to the bone shaft, not the ends, growth plate, or joint surface.

The diaphysis is the shaft of a long bone—the elongated central portion that runs between the two ends. It’s typically composed of dense cortical bone surrounding a medullary cavity that contains bone marrow. The ends of the bone are the epiphyses, where spongy bone and the joint surfaces (articular cartilage) reside. In children, growth occurs at the growth plate (epiphyseal plate) near where the shaft meets the ends. So the diaphysis specifically refers to the bone shaft, not the ends, growth plate, or joint surface.

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