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Instructor: John Williams. The uterus is a key structure in reproduction and fetal development. The uterine cavity, found in the uterus, is a major player in these processes. Let's discuss the structure and functions of the uterine cavity in the female reproductive system.he uterus is a key structure in reproduction and fetal development. The uterine cavity, found in the uterus, is a major player in these processes.
The cervix is the lower third of the uterus and opens into the vagina. The opening into the vagina is called the external os. . The internal os designated the end of the uterine cavity and the beginning of the cervix. The cervix contains a passage way from the uterine cavity to the vagina which is called the endocervical canal. At the end of the endocervical canal is the external os.