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Fig. 2. The four fibro-lamellar bone types observed in the long bones of the king
penguin chick. Undemineralized diaphyseal thin-sections, observed under
ultraviolet light, bone periphery at the top. Two periosteal labels are shown:
(1) alizarin injection 3 weeks after hatching; (2) fluorescein injection at 4
weeks. The outer (top) border of the two labels and the sides of the field
delineate a tissue `patch', the thickness of which was measured to yield
growth rates. (A) longitudinal bone; the asterisks indicate labelling of the
primary osteon filling; (B) radial bone; (C) reticular bone; (D) laminar bone.
Scale bar, 200 µm.
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