THE ARRANGEMENT OF HAVERSIAN SYSTEMS IN A DIAPHYSIS – 4
Top figure
A detail of the external circumferential system of a transversely sectioned diaphysis can be seen at a higher magnification than that on the previous page.
It is the group of parallel, slightly curved bone lamellae that delimit externally the circumference of the diaphysis. The areas occupied by osteocytes are seen as small dark structures (arrows).
A similar system, located on the inner surface of the diaphysis, constitutes the internal circumferential system.
Bottom figure
Shows two stacks of parallel bone lamellae that are part of the intermediate systems. There are millions of small groups like these in the diaphysis. The areas occupied by osteocytes are seen as small dark structures (arrows).
The lamellae of the intermediate system are located between the cylinders of concentric lamellae that constitute the Haversian systems. They are cross-sectioned and marked with the letter H. Note that each system has a central canal called the Haversian canal.
Diaphysis (in cross section). Schmorl’s technique. Magnification: medium.
Diaphysis (in cross section). Schmorl’s technique. Magnification: medium.