cardinal ligament
Summary
The cardinal (Mackenrodt's) ligament is a dense fibrous connective tissue band extending from the lateral cervix and upper vagina to the pelvic sidewall, providing primary support to the uterus and cervix. It runs within the base of the broad ligament and contains the uterine artery and vein. It is a key structure protected during hysterectomy to avoid ureteral injury.
Detail
The cardinal ligament (transverse cervical ligament of Mackenrodt) is one of the main condensations of endopelvic fascia that supports the uterus, cervix, and upper vagina, preventing prolapse. It extends laterally from the cervix and lateral fornix of the vagina to the pelvic side walls (fascia over the obturator internus muscle). Anatomically, it lies at the base of the broad ligament and is closely associated with the uterosacral ligaments, which together form the main suspensory apparatus of the uterus (Level I support in the DeLancey classification of pelvic organ support).
Clinically, the cardinal ligament is critical during hysterectomy because the ureter passes beneath the uterine artery within this ligament ("water under the bridge"), approximately 1-2 cm lateral to the cervix. This anatomic relationship makes the ureter vulnerable to injury during clamping and ligation of the cardinal ligament and uterine vessels, a major complication surgeons must avoid.
Weakness or damage to the cardinal-uterosacral ligament complex (from childbirth, aging, or chronic increased intra-abdominal pressure) contributes to pelvic organ prolapse, including uterine prolapse and vaginal vault prolapse after hysterectomy. Surgical repairs such as sacrospinous ligament fixation or uterosacral ligament suspension aim to restore this level I support.
High-yield associations: - Contains uterine artery/vein - Ureter is nearby (posterior/inferior), at risk during ligation - Provides Level I (apical) support per DeLancey - Important landmark in radical hysterectomy for cervical cancer staging (parametrial invasion assessment)
Sources
- Moore's Clinically Oriented Anatomy
- Williams Gynecology
- DeLancey JO. Anatomic aspects of vaginal eversion after hysterectomy. Am J Obstet Gynecol.
- First Aid for the USMLE Step 1
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