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## Microscopic Anatomy of Bone ### Where are spongy bone and compact bone found? The outer layer of bone is made of tough connective tissue called *periosteum*. It is the location of muscle attachment and bone repair. At the ends of long bones the *Spongy bone layer* is beneath the compact bone. #...

## Microscopic Anatomy of Bone ### Where are spongy bone and compact bone found? The outer layer of bone is made of tough connective tissue called *periosteum*. It is the location of muscle attachment and bone repair. At the ends of long bones the *Spongy bone layer* is beneath the compact bone. ### How do spongy and compact bone differ? Spongy bone is a lattice of *Trabeculae* ("little beams") that are found along *lines* of *stress* for perfect resistance from *Compression*. Between the trabeculae are spaces filled with marrow or blood vessels. Compact bone is arranged in *Cylinders* called *Osteons*. ### Types and functions of specialized bone cells | | Osteoblasts | Osteocytes | Osteoclasts | |---|---|---|---| | Function | Produce new bone | Mature bone cells, make up the majority of bone structure | Break down bone | Canaliculi connect all bone cells, allowing them to receive nutrient and remove wastes. ### Summary *Spongy* bone contains large spaces while compact bone is made of column-shaped *Osteons*. Specialized bone cells build and destroy bone, while *Canaliculi* keep the bone cells connected to nutrients.