Early human development and the chief sources of information on staged human embryos.

  • R O'rahilly
  • Published 1979 in
    European journal of obstetrics, gynecology, and…


In a brief historical survey, the importance of Wilhelm His, senior, to human embryology is emphasized. He provided the impetus to Mall to establish the Carnegie Embryological Collection, which serves as a 'Bureau of Standards' for early human development. The Carnegie system of 23 stages for the embryonic period proper (first 8 postovulatory wk) is… (More)