What is the uterus?
The uterus is an organ of the feminine reproductive system in the pelvic area, behind and above the bladder, ahead of the rectum, continuing down the vagina.
It is an organ with a central cavity, the uterine cavity, covered by the endometrium. The uterine wall is made mostly by a muscular layer called the myometrium.
The endometrium proliferates during the menstrual cycle and flakes off during menstruation, being externalized through the uterine cavity to the vagina and then to the exterior.
The endometrium and myometrium are separated by a layer called junctional line or transitional zone that defines the transition between the endometrium and the myometrium.
The uterus has different areas, being the uterus fundus the superior one, the cervix the inferior, and the body the biggest area, between the fundus and the cervix. The uterine cavity communicates with the interior of the uterine tubes (Fallopian tubes) at the level of the uterine fundus.