What are the cavities of the uterus?

• A. Cervical Canal And Uterus
• B. Internal Os And External Os
• C. Fundus And Body
• D. Myometrium And Endometrium

Answer: (B)

The cavities related to the uterus are the spaces formed by its lumen: the uterine cavity inside the body of the uterus and the cervical canal inside the cervix. These two lumens are continuous, creating the passable cavity through which contents can move between the uterus and vagina. The internal os is the opening where the uterine cavity meets the cervical canal, and the external os is the opening where the cervical canal opens into the vagina—these are openings, not cavities. The fundus and body are parts of the uterus, and the myometrium and endometrium are its muscular and lining tissues, not cavities. So the cavities are the uterine cavity and the cervical canal.