Question

What is the innermost part of the bone called?
1) periosteum
2) compact bone
3) cancellous bone
4) bone marrow


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Answer 1

Bone marrow is the innermost part of bone. The cancellous bone protect it.

Answer 2

The innermost part of the bone is called 4) bone marrow.

• The periosteum is a sheath that covers the bone and it is dense, fibrous connective tissue.
• Cortical bones are the same as compact bones.
• In cortical bones, space is filled with organic and inorganic salts and some spaces between them are known as lacunae.
• Lacunae have bone cells called osteocytes.
• Bone marrow is the present inner side of the bone and is the site for the maturation of B- cells.