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.
The uterine isthmus can become more compressibile in pregnancy, which is a finding known as Hegar's sign.
- N. Jayne Klossner and Nancy T. Hatfield (2006). Introductory Maternity & Pediatric Nursing. Lippincott Williams & Wilkins. p. 56. ISBN 9780781736909.
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