ORGANIZATION OF LAMELLAR BONE IN THE DIAPHYSIS – 3
The figure shows a small area of a cross-section of a diaphysis, observed at low magnification.
Several kinds arrangements of the bone lamellae can be seen:
1 – A system formed by a set of slightly curved parallel lamellae, which extends throughout the periphery of the diaphysis. This is the external circumferential system of lamellae, highlighted in light blue.
2 – A system formed by a set of slightly curved parallel lamellae, which lines the internal diaphysis, delimiting the medullary canal. This is the internal circumferential system of lamellae highlighted in medium blue.
3 – Numerous sets of short parallel lamellae, scattered within the thickness of the diaphysis. These are the intermediate systems of lamellae, highlighted in dark blue.
Several kinds arrangements of the bone lamellae can be seen:
1 – A system formed by a set of slightly curved parallel lamellae, which extends throughout the periphery of the diaphysis. This is the external circumferential system of lamellae, highlighted in light blue.
2 – A system formed by a set of slightly curved parallel lamellae, which lines the internal diaphysis, delimiting the medullary canal. This is the internal circumferential system of lamellae highlighted in medium blue.
3 – Numerous sets of short parallel lamellae, scattered within the thickness of the diaphysis. These are the intermediate systems of lamellae, highlighted in dark blue.
Most of the diaphysis wall is occupied by circular structures. These are Haversian systems, transversely sectioned, highlighted in red.
Observe that the intermediate systems fill the spaces between Haversian systems.
