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Lack of spontaneous ovarian contractions in the baboon

Histological observations on the ovaries of various species reveal smooth muscle fibres throughout the stroma and theca interna (Lambertsen, Greenbaum, Wright & Wallach, 1976). Ovarian contractions have been observed and recorded in vitro and in vivo in an equally diverse number of species (Wright, Wallach, Fromm & Jeutter, 1976). Although the physiological significance of spontaneous ovarian contractions is not known it has been suggested that they may be in some way related to the mechanism of ovulation (Lipner & Maxwell, 1960). This speculation is supported by the observation that the frequency of spontaneous ovarian contractions increases about the time of ovulation (Virutamasen, Wright & Wallach, 1973).