The Pisiform Bone


PROF. H. A. HARRIS'S1 rediscovery of the secondary centre of ossification in the pisiform confirms the work of Retterer2, who found it in cat, dog and rabbit, and Sieglbauer3, who found it in chimpanzee, gorilla, Tarsius, Stenops and Macacus. But his conclusions from its "hitherto unsuspected existence" are scarcely justifiable, for there is no reason for believing that secondary centres are a prerogative of one type of skeletal element. His letter does raise the question of what criteria can be used to determine whether a bone is a sesamoid.

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HAINES, R., HUGHES, H. The Pisiform Bone. Nature 154, 181–182 (1944).

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