Measurement of spontaneous motility in vitro of the cervical ring in sheep

: Spontaneous motility has been observed within in vitro preparations by different annulars of the cervix, as well as the characteristics shown this structure. This motor activity is cyclic, amplitude and tone not changing from some annulars to others, working on two grammes tension, but frequency and rhythm show large changes, altering the frequency from 7.3 contractions to minute in the first annular to 4.05 in the fifth annular. However, there appears denticulate peaks, with an incidence of 11% in the first annular, growing to 100% in the fifth annular.