1. Medical School Histology: Images of compact bone
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Dr. Larry Johnson Texas A&M University

2. Observe/manipulate the images on your computer
PowerPoint slides on YouTube VIBS Histology
and at

3. FUNCTIONS OF BONE SKELETAL SUPPORT LAND ANIMALS PROTECTIVE ENCLOSURE
SKULL TO
PROTECT BRAIN
LONG BONE TO PROTECT HEMOPOIETIC CELLS

4. COMPACT BONE - SHAFT AND OUTER SURFACE OF LONG BONES
Spongy
Spongy

5. Vertebra Periosteum Compact bone Spongy bone Endosteum Endosteum
Fibrous periosteum containing fibroblasts
Bone
Osteocyte in lacunae
Osteoblasts lining bony trabeculae
Endosteum
Spongy
bone

6. CELLS OF BONE OSTEOBLASTS - SECRETE OSTEOID - BONE OSTEOCYTE =
EXPAND BONE BY APPOSITIONAL GROWTH
OSTEOCYTE =
OSTEOBLAST
TRAPPED IN
MATRIX OF
BONE

7. EXTRACELLULAR MATRIX OF BONE
SECRETED by POLARIZED OSTEOBLASTs
CALCIFICATION - ADDS FIRMNESS, BUT PREVENTS DIFFUSION THROUGH MATRIX MATERIAL
Osteocytes

8. EXTRACELLULAR MATRIX OF BONE
FORMS LACUNAE AND CANALICULI -

9. EXTRACELLULAR MATRIX OF BONE
FORMS LACUNAE AND CANALICULI - CAUSES THE NEED FOR NUTRIENTS TO PAST THROUGH THE MANY GAP JUNCTIONS BETWEEN OSTEOCYTES VIA CANALICULI

10. COMPACT BONE,
REMODELING
(Spongy
bone)

11. COMPACT BONE,
REMODELING
(Spongy bone)

12. COMPACT BONE
HAVERSIAN SYSTEMS - LAMELLAE OF BONE AROUND HAVERSIAN CANAL

13. Compact bone (ground cross section)
Osteon or
Haversian systems
Compact bone (ground cross section)
Volkmann’s canal
Canaliculli
Concentric lamellae
Osteon/ Haversian systems
Haversian canal
Lacunae containing osteocyte
Interstitial lamellae

14. Compact bone (ground cross section)
Connecting adjacent osteons, perforating (Volkmann’s) canals provide communication for osteons and another source of microvasculature for the central canals of osteons (nutrients, blood, etc.).
Volkmann’s canal

15. Download actual images at
Bone –

16. The End