internal cervical os
Opening of uterine cervix into the body of the uterus. [ http://orcid.org/0000-0002-6601-2165 ]
Term info
internal cervical os
The internal orifice of the uterus (or internal orifice of the cervix uteri or internal os) is an interior narrowing of the uterine cavity. It corresponds to a slight constriction known as the isthmus that can be observed on the surface of the uterus about midway between the apex and base[Wikipedia:Internal_orifice_of_the_uterus].
uberon
internal orifice, internal os
UBERON:0013759