HISTOLOGY REVIEW Bone Tissue Dr Tim Ballard Department

HISTOLOGY REVIEW Bone Tissue Dr. Tim Ballard Department of Biology and Marine Biology

Compact bone Human bone – ground – cross section -- India ink – 4 x objective This is a section of dried and long dead ground compact bone. The living cells are gone, leaving behind spaces that can be back-filled with India ink. The arrowheads indicate osteons or Haversian systems. An osteon is that bony tissue surrounding and a part of a single Haversian canal.

Compact bone Human bone – ground – cross section -- India ink – 10 x objective osteon interstitial lamellae Interstitial lamellae are layers of old bone tissue from an osteon that is bring destroyed by remodeling.

Compact bone Human bone – ground – cross section -- India ink – 20 x objective lamellae osteocytic lacuna Haversian canal interstitial lamellae Each osteon runs more-or-less parallel to the long axis of the bone. If you see a canal that is perpendicular, it is a Volkmann’s canal.

Compact bone Human bone – ground – cross section -- India ink – 40 x objective lamellae canaliculi Haversian canal osteocytic lacuna Canaliculi are tiny canals passing through the bone matrix, connecting one osteocyte to another, ultimately connecting them all to the Haversian canal. end