Abstract
IN chicken embryos it is known that lung ventilation begins when, or just before, the embryo pierces the membrane dividing it from the air space, and is well established before hatching. Breathing is intermittent and irregular at first, becoming more regular and more rapid as hatching approaches1,2. It has also long been known that respiration in chicken embryos may be accompanied by a loud regular clicking3,4. Apart from the connexion with respiration, it is not known how these clicks are produced, although in duck embryos observed through holes made in the shell clicks are reported to coincide with movements of inspiration or expiration or both4.
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References
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VINCE, M., SALTER, S. Respiration and Clicking in Quail Embryos. Nature 216, 582–583 (1967). https://doi.org/10.1038/216582a0
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DOI: https://doi.org/10.1038/216582a0
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