What is the role of epiphyseal discs in growing individuals?

• A. Allow Normal Bone Lengthening
• B. Provide Joint Stability
• C. Store Calcium
• D. Attach Muscles

Answer: (A)

Epiphyseal discs, or growth plates, are the sites where bone length increases during development. They are bands of cartilage between the end (epiphysis) and shaft (diaphysis) of a bone. New cartilage cells proliferate and then ossify from the diaphyseal side, gradually lengthening the bone as the child grows. When growth ends, these plates ossify and leave an epiphyseal line. So their main role is enabling normal bone lengthening in growing individuals.

They aren’t responsible for joint stability—that comes from ligaments and the joint capsule—nor do they store calcium, and they aren’t where muscles attach; muscles anchor to bone surfaces and tendons, not the growth plate.