What are the Cardinal ligaments of uterus ?
**Core Concept**
The Cardinal ligaments of the uterus are a group of fibromuscular structures that provide support to the uterus, cervix, and vagina. They play a crucial role in maintaining the pelvic organ's position and preventing prolapse.
**Why the Correct Answer is Right**
The Cardinal ligaments are primarily composed of the pubocervical fascia and the uterosacral ligaments, which are attached to the cervix and the sacrum, respectively. These ligaments work together to counteract the effects of gravity and maintain the uterus in its normal position. The uterosacral ligaments are also rich in smooth muscle and are thought to contribute to the regulation of uterine contractions during menstruation and pregnancy.
**Why Each Wrong Option is Incorrect**
**Option A:** The Round ligaments of the uterus are another set of fibromuscular structures that run from the cervix to the labia majora, but they are not part of the Cardinal ligaments.
**Option B:** The Cervicovaginal fascia is a layer of connective tissue that surrounds the cervix and vagina, but it is not a specific ligamentous structure.
**Option C:** The Obturator internus muscle is a muscle that originates from the inner surface of the obturator membrane and inserts into the greater trochanter of the femur, but it is not related to the Cardinal ligaments of the uterus.
**Clinical Pearl / High-Yield Fact**
The Cardinal ligaments are also known as Mackenrodt's ligaments, named after the German gynecologist Friedrich Mackenrodt, who first described them in the late 19th century.
**Correct Answer:** D.