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Summary.

  • 1
    The relative proportions and distribution of the zygomatic and infraorbital branches of the maxillary nerve have been examined in twenty-one New World Monkeys, representing eight genera.
  • 2
    In the subfamilies Aotinae and Pitheciinae the infraorbital nerve is bigger than the zygomatic, and twigs of its lateral branch form a plexus with filaments of the facial nerve.
  • 3
    In the Atelinae and Cebinae, the zygomatic nerve is the bigger and some of its fibres are fasciculated with those of the seventh nerve.
  • 4
    This variation in relative proportions is not correlated with any gross anatomical differences with facial structures in these monkeys.