Bones: classification, structure, ossification
Human Anatomy · MBBS
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A 14-year-old boy's X-ray shows a dark line across the lower end of the femur. This is the epiphyseal (growth) plate — cartilage where new bone forms, making the bone longer. It appears dark on X-ray because cartilage is radiolucent. After puberty it ossifies into the epiphyseal line and length growth stops. That's why the doctor can estimate remaining height growth from it.
Related topics
- General anatomy: anatomical terms and planes
- Joints: classification, types of synovial joints
- Muscles: types, structure, actions
- Upper limb: pectoral region, axilla, arm, forearm, hand
- Lower limb: gluteal region, thigh, leg, foot, arches
- Thorax: thoracic wall, lungs, pleura, mediastinum, heart, great vessels