Macaca cyclopis(Mammalia, Primates): anterior view of the facial musculature; muscles such as the buccinatorius, platysma, frontalis, and occipitalis are not shown; on the left side the depressor supercilii was removed and the orbicularis oculi, zygomaticus minor, zygomaticus major, levator labii superioris, levator labii superioris alaeque nasi were partially cut (modified from Shibata, 1959 and Jouffroy & Saban, 1971; the nomenclature of the structures illustrated basically follows that used in the present work). COS, corrugator supercilii; DES, depressor supercilii; DLI, depressor labii inferioris; DSN, depressor septi nasi; LAO, levator anguli oris facialis; LELS, levator labii superioris; LELSA, levator labii superioris alaeque nasi; MENT, mentalis; NAS, nasalis; OROC, orbicularis oculi; OROR, orbicularis oris; PRO, procerus; ZYMA, ZYMI, zygomaticus major and zygomaticus minor.