EVERYDAY SCIENCE

Detailed explanation-1: -Periosteum – the dense, tough outer shell that contains blood vessels and nerves. Compact or dense tissue – the hard, smooth layer that protects the tissue within. Spongy or cancellous tissue – the porous, honeycombed material found inside most bones, which allows the bone to be strong yet lightweight.

Detailed explanation-2: -Bones are composed of two layers: a tough outer layer and a spongy inner layer. The outer layer, known as cortical or compact bone, is strong and dense.

Detailed explanation-3: -The periosteum, endosteum and perichondrium are all layers of tissue in and around your bones. The periosteum is the sheath outside your bones that supplies them with blood, nerves and the cells that help them grow and heal. The endosteum is a membrane that lines the center of your bones that contain bone marrow.

Detailed explanation-4: -Bone contains three types of cells: osteoblasts (AHS-tee-uh-blastz), which make new bone and help repair damage. osteocytes (AHS-tee-o-sites), mature bone cells which help continue new born formation. osteoclasts (AHS-tee-o-klasts), which break down bone and help to sculpt and shape it.

Detailed explanation-5: -Periosteum. Cortical, or Hard Bone. Cancellous, or Spongy Bone. Bone Marrow.