 Objectives The objective of this research is to study the hypothesis that the cervical canal is an active gynecologic organ responding to the cyclic ovulation hormones comparable to its known hormonal response in obstetrics. We hypothesized that cervical canal diameter changes have a significant correlation with dominant follicle growth during ovulation. This is tested against the null hypothesis that cervical canal diameter doesn’t correlate with ovulation changes.  Patients and method We studied 60 patients in childbearing age who were examined by transvaginal 2D ultrasound on menstrual days 7, 11 and 13. Monitoring included cervical canal diameter and dominant follicle size.  Results: 60 patients in childbearing age (ranging between 18 and 39 years). The mean cervical diameter on day 13 was 2.2083 mm (SD=.80471). the mean diameter of the dominant follicle on day 13 was 20.7483 mm (SD=2.73945). a strong positive correlation was found between the diameter of the cervical canal and the diameter of the dominant follicle. There is a negative correlation between patient age and dominant follicle size on day 13 (P<0.001) and cervical canal diameter on day 13 (insignificant statistically).  Conclusion The uterine cervix has cyclic anatomical changes in non-pregnant women in addition to the known cyclic changes in endocervical secretions.