Above all, home security is all about peace of mind. So as you consider the DIY options, think about what will actually make you feel safe. Is video surveillance a big deal?
The osteon is the primary structure that makes up the hard outer layer of bones, which is generally known as â cortical bone .â Cortical bone, or compact bone, is dense, mature bone found in vertebrates such as mammals, amphibians, reptiles, and birds. It is this dense hard layer that gives a person or animal strength.
Lesson Summary. Trabeculae are thin columns and plates of bone that create a spongy structure in cancellous bone, which is located at the ends of long bones, and in the pelvis, ribs, skull, and vertebrae.one tissue is formed by cells called osteoblasts and is secreted in rings called lamellae that expand outward as the trabeculae get larger. As new tissue grows around the osteoblast, a hard ceramic material called calcium phosphate begins to surround the cell.