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. 2013 Jul 9;4:2107. doi: 10.1038/ncomms3107

Figure 3. Membranous bone formation of the rib in birds.

Figure 3

Hematoxylin-eosin-Alcian-blue-stained cross-section of the rib in a chicken (Gallus gallus) embryo at stage 40. (a) Delicate bony trabeculae (osteoids) at the insertion of the intercostal muscle (icm). Arrows indicate protrusion of bony trabeculae. Scale bar, 100 μm. (b) Bony trabeculae at the insertion of the intercostal muscle (icm). Scale bar, 100 μm. btr, bony trabecula; plc, pleural cavity; pob, periosteal bone collar; pos, periosteum; ost, osteoblast.