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Background and Objective: Mammalian compact bone is composed mostly ofHaversian system. Although there are many studies describing the typicalHaversian system in mammals, there are few studies conducted on bones fromnon-mammalian species. The objective of the current study was to investigatethe existence of the typical Haversian system in compact bones from reptilesand birds. Materials and Methods: Femora were collected from geckos, Nilemonitors, sparrows, ducks and geese. Samples were then, fixed in 10%paraformaldehyde and embedded in paraffin. Paraffin sections were stained withhematoxylin and eosin or Von Kossa and then examined using light microscopy.Results: The current study showed different histological structures of compactbones from studied species and an absence of the typical Haversian system seenin mammals. The compact bone of geckos was mostly avascular, while Nile monitorbone was highly vascular. Sparrow bone showed one side vascular and the otherside avascular. The vascularity was represented by primary vascular canalssurrounded by a few irregularly arranged osteocytes inside their lacunaeforming primary osteons. Bone tissue from ducks and geese were similar and werecomposed mostly of dense Haversian tissue, while some areas had primaryosteons. Conclusion: The compact bone microstructure in some reptile and birdspecies lack the typical Haversian system described in mammals. This will be ofa great importance in developing a better understanding of long bone anatomyand physiology in different species.

Absence of Typical Haversian System from the Compact Bone of Some Reptile and Bird Species