[Microscopic anatomy and muscle architecture of the commissure of the lips in the newborn infant and the adult].

  • Guillaume Couly
  • Published 1976 in
    Revue de stomatologie et de chirurgie maxillo…

Abstract

The muscular structure of the commissura of the buccal orifice in humans confers on it a special significance. It consists of two layers each apparently having a well-defined function. Deep layer. Quite distinct at the embryonic stage, it develops rapidly in the new-born. It consists of the internal orbicular muscle, or Poirier's sphincter oris, and the two… (More)

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