- axial skeleton has skull and vertebrae
Bone Composition
- made of Mesoderm
Types of Bone
- Compact bone is super strong
- Dense and strong
- Bone matrix
- Organic: Collagen, glycoproteins, peptides
- Calcium, phosphate, and hydroxide ions
- Hydroxyapatite crystals
- Structural units called osteons or Haversian canals
- Lamellae concentric circles of bony matrix
- Longitudinal Haversian canals
- transverse Volkmann’s canals
- space = lacunae
- Spongy bone also called cancellous bone
- has bone spicules called trabeculae
- Cavities between with bone marrow
- Has red marrow
- FIlled with hematopoietic stem cells
- Yellow marrow are made of fat
- Has red marrow
- Long bones
- appendicular skeleton
- diaphyses that swell into metaphyses and ends in epiphysis
- Outer is compact bone and inside is spongy bone
- End is epiphyseal growth plate
- Surrounded by periosteum