The bones are of 3 types:
1. Membranous or Investing bones –
- They are formed by ossification in the membranes situated below the embryonic skin.
- They invest soft cartilaginous parts of the skeleton & provide them strength.
- Example: Flat bones of skull, clavicle, bones of digits etc.
2. Cartilaginous or Replacing bones –
- It is formed in place of hyaline cartilage.
- The matrix of the cartilage is destroyed by special osteoclasts.
- Example: Bones of limbs, vertebral column, some bones of the skull.
3. Sesamoid bones –
- It is formed by the ossification in the ligament.
- Example: Patella’s bone.
