This specimen shows the uterine cavity and the cervical canal.
The uterus is divided into the fundus, the body and the cervix. In coronal section, the uterine cavity is triangular, broad above where the two uterine tubes join the uterus, and narrow below at the internal os of the cervix. The cervical canal is 2.5 cm long. The upper end communicates with the uterine cavity through the internal os and the lower end opens into the vagina at the external os. In nulliparous women, the external os is usually a circular aperture, whereas after childbirth it is a transverse slit.