Template:Streeter-embryo to fetus

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In 1949 the embryologist Streeter[1] used the replacement of cartilage within the humerus by bone marrow as an arbitrary definition of the embryo to fetus transition.


"If the onset can be recognized in a given specimen, that specimen is straightway classed as a fetus."
 Embryology History George Streeter


  1. ↑ Streeter GL. Developmental horizons in human embryos (fourth issue). A review of the histogenesis of cartilage and bone. (1949) Carnegie Instn. Wash. Publ. 583, Contrib. Embryol., 33: 149-169. PMID: 18144445
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