The isthmus is the short, narrowed part of the uterus about 1 cm long between the body and the cervix. In late pregnancy it stretches to form the lower uterine segment.
| Location | Between the body of the uterus and the cervix, at the level of the internal os |
|---|---|
| Parts |
|
| Nerve Supply | Uterovaginal plexus (inferior hypogastric plexus) |
| Blood Supply | Uterine artery |
| Venous drainage |
|
| Lymphatic drainage |
|
Connects body and cervix and in pregnancy expands to become the thin lower segment.
Caesarean sections are usually made through the lower segment because it bleeds less and heals more strongly. A scar defect here (isthmocele) can cause spotting and affect later pregnancies.
A pouch at the caesarean scar causing abnormal bleeding.
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