The uterine isthmus is the inferior-posterior part of
uterus
The uterus (from Latin ''uterus'', : uteri or uteruses) or womb () is the hollow organ, organ in the reproductive system of most female mammals, including humans, that accommodates the embryonic development, embryonic and prenatal development, f ...
, on its
cervical end — here, the uterine muscle (
myometrium) is narrower and thinner. It connects the
body and cervix.
The uterine isthmus can become more compressibile in pregnancy, which is a finding known as
Hegar's sign.
References
Uterus
{{genitourinary-stub, sex=female