The Function of the Naso-Labial Groove of Plethodontid Salamanders

@article{Brown1966TheFO,
  title={The Function of the Naso-Labial Groove of Plethodontid Salamanders},
  author={Charles E. Brown and Bernard S. Martof},
  journal={Physiological Zoology},
  year={1966},
  volume={39},
  pages={357 - 367}
}
T HE naso-labial groove is diagnostic of lungless salamanders (Plethodontidae). It extends from the latero-ventral portion of the external naris ventrally onto the upper lip. The external naris is equipped with a set of involuntary muscles, Musculus dilatator naris and M. constrictor naris (Bruner, 1902). The constrictor is situated in the lateral wall of the nasal orifice; its fibers form a crescent-shaped fold which partly encircles the naris. When the fibers contract, the fold extends across… 
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