Milia are small, white cysts commonly seen around the cheeks. Overview. Milia are commonly found on the skin of people of all ages. They are formed when keratin (a substance produced by the skin) becomes entrapped beneath the outer layer of the skin, forming a tiny cyst. An individual milium (the singular of milia) is formed at the base of a hair follicle or sweat gland.
The basic first level structure of cortical bone are osteons. Trabecular bone is much more porous with porosity ranging anywhere from 50% to 90%. It is found in the end of long bones (see picture above), in vertebrae and in flat bones like the pelvis. Its basic first level structure is the trabeculae. III.
Compact Bone. The diagram above shows a transverse view of an osteon (Haversian system) - the basic unit of compact bone. The diagram above shows a longitudinal view of an osteon. Some, mostly older, compact bone is remodelled to form these Haversian systems (or osteons).The osteocytes sit in their lacunae in concentric rings around a central Haversian canal (which runs longitudinally).ompact Bone. The diagram above shows a transverse view of an osteon (Haversian system) - the basic unit of compact bone. The diagram above shows a longitudinal view of an osteon. Some, mostly older, compact bone is remodelled to form these Haversian systems (or osteons).