Changes

===Girth===

===Girth===

*The '''perisosteum''' lines the outer surfae of the diaphysis of the [[Bones and Cartilage - Anatomy & Physiology#Types of Bone|bone]].

The '''perisosteum''' lines the outer surfae of the diaphysis of the [[Bones and Cartilage - Anatomy & Physiology#Types of Bone|bone]]. It has a cellular inner layer, consisting of osteoblasts, and a fibrous outer layer. The '''endosteum''' lines the inner surface of the diaphysis of the bone. It contains osteoblasts ''and'' osteoclasts. Bone growth occurs by a shift in the equilibrium between osteoblasts and osteoclasts. Osteoblasts on the outside in the periosteum, add bone to increase the bone's diameter. Osteoclasts on the inside in the endosteum remove this bone to maintain the bone diameter. When osteoclasts start removing less bone, or osteoblasts start adding more bone, the girth increases.

**It has a cellular inner layer, consisting of osteoblasts, and a fibrous outer layer.

*The '''endosteum''' lines the inner surface of the diaphysis of the bone.

**It contains osteoblasts ''and'' osteoclasts.

*''Bone growth occurs by a shift in the equilibrium between osteoblasts and osteoclasts''.

**Osteoblasts on the outside in the periosteum, add bone to increase the bone's diameter.

**Osteoclasts on the inside in the endosteum remove this bone to maintain bone diameter.

**When osteoclasts start removing less bone, or osteoblasts start adding more bone, the girth increases.

==Joint Formation==

==Joint Formation==