Uterine muscles, also known as the myometrium, are the smooth muscle layers of the uterus. They play a crucial role in various reproductive functions, including menstruation and childbirth. The myometrium contracts rhythmically to help expel the menstrual lining and facilitate labor during delivery. These muscles are composed of three layers: the outer longitudinal layer, the middle circular layer, and the inner oblique layer. The strength and coordination of these contractions are essential for effective uterine function, ensuring that the uterus can support a developing fetus and respond to hormonal changes throughout the menstrual cycle.