Uterine isthmus

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Not to be confused with Isthmus of uterine tube.
Uterine isthmus
Latin Isthmus uteri
Anatomical terminology

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.[1]

The uterine isthmus can become more compressibile in pregnancy, which is a finding known as Hegar's sign.


  1. ^ N. Jayne Klossner and Nancy T. Hatfield (2006). Introductory Maternity & Pediatric Nursing. Lippincott Williams & Wilkins. p. 56. ISBN 9780781736909.