Diaphysis

The diaphysis (from the Greek diaphyomai - to grow in the middle, between something) is the middle part of the tubular bone between the epiphyses. The diaphysis consists mainly of compact bone tissue and is surrounded by periosteum.

The diaphysis contains the medullary canal, which contains yellow bone marrow. The bone marrow performs a number of important functions, in particular, it is the site of hematopoiesis.

Outside, the diaphysis is covered with a perivascular layer of periosteum. Through openings in the periosteum (diaphyseal or nutrient foramina), blood vessels, nerves and lymphatic vessels approach the bone.

The diaphysis provides mechanical strength to the bone and protects the bone marrow contained within it. Bone growth in length occurs precisely in the area of ​​the diaphysis due to the work-cartilage of the growth zone.

The diaphysis is the part of the bone that is located between the two epiphyses (articular end or ends) and is its widest section.

The diaphysis is the only bone in the human body that does not have a connective tissue membrane of the periosteum. Its strength is ensured by the presence of osteons located in several rows - spongy bone beams, penetrated by a network of blood vessels and surrounded by dense connective tissue.

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