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Quarterly Journal of Microscopical Science, Vol s2-77, 77-97, Copyright © 1934 by Company of Biologists

Memoirs: Epiphysial Growth in the Branchial Skeleton of Fishes

R. WHEELER HAINES 1

1 Assistant Anatomist to the University of Cape Town

The branchial bones of several bony fishes were studied in longitudinal section, and in one case a reconstruction model was made. A massive cartilaginous epiphysis lies partly enclosed within the shaft of the bone and partly beyond it. In the cartilage there can be distinguished a zone of undifferentiated cells lying beyond the bony shaft, a proliferative zone of flattened cells at the level of the end of the shaft, and a zone of hypertrophied cells no longer undergoing division enclosed within the shaft. In some cases there is a secondary centre of calcification in the zone of undifferentiated cells.

The mechanism of growth of the epiphysis and the formation of endochondral bone are similar to those found in the long bones of tetrapods, but in their details they are more simple in the fish.






© The Company of Biologists Ltd 1934