The womb opens into vagina through _______.

The womb (or uterus) opens into vagina through cervix. The cervix is the lower part of the uterus. In a non-pregnant woman, the cervix is usually between 2 and 3 cm long and roughly cylindrical in shape. The narrow, central cervical canal runs along its entire length, connecting the uterine cavity and the lumen of the vagina. The opening into the uterus is called the internal os and the opening into the vagina is called the external os.