Diaphysis
Diaphysis (pronounced: /daɪˈæfɪsɪs/) is a term used in anatomy to refer to the main or mid section (shaft) of a long bone. The diaphysis is the tubular, hollow part of the bone that provides strong, sturdy support without cumbersome weight.
Etymology
The term "diaphysis" originates from the Greek word "diaphusis", meaning "growing through".
Structure
The diaphysis is made up of a strong, thick compact bone known as cortical bone. Inside this compact bone is the medullary cavity, which is filled with bone marrow. The diaphysis also contains blood vessels that enter the bone through small holes. These blood vessels supply the bone with nutrients and help remove waste.
Related Terms
- Epiphysis: The end part of a long bone, initially growing separately from the shaft.
- Metaphysis: The narrow portion of a long bone between the epiphysis and the diaphysis.
- Periosteum: A dense layer of vascular connective tissue enveloping the bones except at the surfaces of the joints.
- Endosteum: A thin vascular membrane of connective tissue that lines the inner surface of the bony tissue that forms the medullary cavity of long bones.
See Also
External links
- Medical encyclopedia article on Diaphysis
- Wikipedia's article - Diaphysis
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