Uterine isthmus
Encyclopedia
The uterine isthmus is the inferior-posterior part of uterus, on its cervical
end — here the uterine muscle (myometrium
) is narrower and thinner. It connects superiorly-anteriorly to the complementary parts of the uterus
: the body and the fundus
.
Cervix
The cervix is the lower, narrow portion of the uterus where it joins with the top end of the vagina. It is cylindrical or conical in shape and protrudes through the upper anterior vaginal wall...
end — here the uterine muscle (myometrium
Myometrium
The myometrium is the middle layer of the uterine wall, consisting mainly of uterine smooth muscle cells , but also of supporting stromal and vascular tissue...
) is narrower and thinner. It connects superiorly-anteriorly to the complementary parts of the uterus
Uterus
The uterus or womb is a major female hormone-responsive reproductive sex organ of most mammals including humans. One end, the cervix, opens into the vagina, while the other is connected to one or both fallopian tubes, depending on the species...
: the body and the fundus
Fundus (uterus)
The fundus of the uterus is the top portion, opposite from the cervix.Fundal height, measured from the top of the pubic bone, is routinely measured in pregnancy to determine growth rates...
.