VOLKMANN’S CHANNELS
Thinner blood vessels (branches of arteries and tributaries of veins) are distributed in bones inside called Volkmann's canals, that connect adjacent Haversian systems. They canals can be recognized in cross-sections of diaphyses because they are distributed radially in relation to the medullary cavity.
One of these canals can be seen in the image, highlighted in red.
H - Haversian systems
I - inner or intermediate bone lammelae
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Diaphysis (in cross section). Schmorl's technique. Medium magnification: .
