the innermost wall of the uterus is called
The body of the uterus has 3 layers. The inner layer or lining is called the endometrium. The serosa is the layer of tissue coating the outside of the uterus. In the middle is a thick layer of muscle that is also known as the myometrium. This muscle layer is needed to push a baby out during childbirth.he inner layer or lining is called the endometrium. The serosa is the layer of tissue coating the outside of the uterus. In the middle is a thick layer of muscle that is also known as the myometrium. This muscle layer is needed to push a baby out during childbirth.