1. Microscopic Anatomy of Bone

2. Microscopic Anatomy of Compact Bone
Osteocytes are situated within cavities known as lacunae
Lacunae are arranged in concentric rings called lamellae
Lamellae are rings situated around the central (Haversian) canal
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3. Figure 5.4a Microscopic structure of compact bone.
Spongy bone
Perforating (Volkmann’s) canal
Osteon (Haversian system)
Blood vessel continues into medullary cavity containing marrow
Lamellae
Blood vessel
Compact bone
Central (Haversian) canal
Perforating (Sharpey’s) fibers
Periosteum
Periosteal blood vessel
(a)

4. Microscopic Anatomy of Bone
Central (Haversian) canal
Opening in the center of an osteon
Runs lengthwise through bone
Carries blood vessels and nerves
Osteon (Haversian system)
A unit of bone containing central canal and matrix rings
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5. Figure 5.4b Microscopic structure of compact bone.
Lamella
Osteocyte
Canaliculus
Lacuna
Central
(Haversian) canal
(b)

6. Figure 5.4c Microscopic structure of compact bone.
Osteon
Interstitial lamellae
Lacuna
Central
(Haversian) canal
(c)

7. Microscopic Anatomy of Bone
Canaliculi
Tiny canals
Radiate from the central canal to lacunae
Form a transport system connecting all bone cells to a nutrient supply
Perforating (Volkmann’s) canal
Canal perpendicular to the central canal
Carries blood vessels and nerves
© 2015 Pearson Education, Inc.

8. Figure 5.4a Microscopic structure of compact bone.
Spongy bone
Perforating (Volkmann’s) canal
Osteon (Haversian system)
Blood vessel continues into medullary cavity containing marrow
Lamellae
Blood vessel
Compact bone
Central (Haversian) canal
Perforating (Sharpey’s) fibers
Periosteum
Periosteal blood vessel
(a)

9. © 2015 Pearson Education, Inc.
Bone Components
Organic parts of the matrix make bone flexible
Calcium salts deposited in the matrix make bone hard
© 2015 Pearson Education, Inc.