326 



Basic Structure of Vertebrates 



Fig. 267. (A) Stereogram representing a sector of the shaft of a long bone. (B) 

 Transverse section, much more enlarged, showing part of one Haversian system. 

 (bl) Bone lamellas; (c) canaliculi; (h) Haversian canal; (I) lacuna. (Courtesy, 

 Kingsley: "Comparative Anatomy of Vertebrates," Philadelphia, The Blakiston 

 Company.) 



Fig. 268. Section, highly magnified, of compact bone from the shaft of the 

 human humerus. The section, cut transversely to the long axis of the bone, shows 

 four Haversian systems with their central canals, concentric lamellas of bone, 

 lacunas between adjacent lamellas, and canaliculi extending between lacunas. 

 (After Sharpey. Courtesy, Bremer: "Text-Book of Histology," Philadelphia, The 

 Blakiston Company.) 



