Final answer:
Bones that grow within tendons are known as sesamoid bones, such as the patella at the knee joint.
Explanation:
True, bones that grow within tendons are called sesamoid bones. These bones are small, flat, and shaped like a sesame seed. One common example of a sesamoid bone is the patella, commonly known as the kneecap, which develops inside a tendon near the knee joint.
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