What is sesamoid bone ? Give one example .

Explanation

### Step-by-Step Text Solution:

1. **Definition of Sesamoid Bone**:
- Sesamoid bones are specialized bones that develop within tendons, typically in locations where tendons pass over joints. They are usually small, round, and disc-like in shape.

2. **Function of Sesamoid Bones**:
- The primary function of sesamoid bones is to increase the strength and stability of the joint. They help in reducing friction and improving the mechanical advantage of the muscles that act on the joint.

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