1. Bone Structure

2. Bone Tissue Characteristics
Bone is also called osseous tissue
Are a supporting connective tissue

3. 2 Types of Bone Tissue
Compact (dense)
Spongy (cancellous)

4. Compact Bone
Has a repeating functional unit called the osteon, or Haversian system
Osteon is made of concentric circles of lamella
Surrounding a central canal that has blood vessels in it
Perforating canals allow for blood vessels in the central canals to be linked to other vessels
Covers all bone surfaces except articulating surfaces
Found in highly stressed areas, diaphysis of long bones

5. Compact Bone Osteon Central canal Perforating canal Osteocyte Lacuna
Bone matrix

6. Spongy Bone Has no osteons The lamellae form rods called trabeculae
Found in the epiphyses of long bones and inside short, flat & irregular bones
Much lighter than compact bone
Reducing the work of muscles to move bones

7.
Spongy bone
Cellular layer
of periosteum
Marrow cavity
Fibrous layer
of periosteum
Compact bone
Small vein
Capillary
Lamellae
Canaliculi
Lamellae
Osteons
Endosteum
Central
canal
Vein
Artery
Osteon
Lacunae
Osteon
LM x 343
In this thin section through compact bone, the intact matrix making up the lamellae appears white, and the central canal, luacunae, and canaliculi appear black due to the presence of bone dust.
Central
canal
Perforating
canal
Trabeculae
of spongy bone
This diagrammatic view depicts the parallel osteons of compact bone and the trabecular network of spongy bone.
© 2013 Pearson Education, Inc.

8. Compact and Spongy Bone