In the discussion Dr. ROACH was asked whether the longitudinal muscle is spontaneously active. She answered that it contracts very quickly after delivery. So it can only be studied if the cord is cross-clamped in order to prevent the contraction. This is not the same mechanism as that during critical closure.

Copyright information

© Springer-Verlag Berlin · Heidelberg 1972

Authors and Affiliations

  • E. Betz
    • 1
  1. 1.TübingenGermany

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