Terminology Service for NFDI4Health

external cervical os

Go to external page http://purl.obolibrary.org/obo/UBERON_0013760


Opening of uterine cervix into the vagina. [ http://orcid.org/0000-0002-6601-2165 ]

Term info

Label

external cervical os

Synonyms
  • external os of uterus
  • ostium uteri
database cross reference
external definition

The external orifice of the uterus (or ostium of uterus, or external os) is a small, depressed, somewhat circular aperture on the rounded extremity of the vaginal portion of the cervix. Through this aperture, the cervical cavity communicates with that of the vagina. The external orifice is bounded by two lips, an anterior and a posterior. The anterior is shorter and thicker, though it projects lower than the posterior because of the slope of the cervix. Normally, both lips are in contact with the posterior vaginal wall. Prior to pregnancy, the external orifice has a rounded shape when viewed through the vaginal canal (as through a speculum). Following parturition, the orifice takes on an appearance more like a transverse slit or is 'H-shaped'[Wikipedia:External_orifice_of_the_uterus].

has related synonym

ostium of uterus, external os

id

UBERON:0013760

Term relations