Assertion: center's opening | /r/HasProperty | internal os
Facets:
Source sentences:
text: The cervical opening into the vagina is called the external os; the cavity running the length of the cervix is the endocervical canal; the opening of the endocervical canal into the uterine cavity, the internal os.
text: The cervical opening into the vagina is called the external os; the cavity running the length of the cervix is the endocervical canal; the opening of the endocervical canal into the uterine cavity, the internal os.