Layers in uterus
The three layers, the innermost to outside are as follows:
The lining of the uterine cavity is called the "endometrium". It consists of the functional endometrium and the basal endometrium from which the former arises. Damage to the basal endometrium results in the formation of adhesions and / or fibrosis (Asherman's syndrome). In all placental mammals, including humans, endometrium periodically builds a coating which is poured or resorbed unless pregnancy occurs. Detachment of functional endometrial lining is responsible for menstrual bleeding (colloquially known as "period" in humans, with a cycle of about 28 days, + / -7 days flow and + / -21 days of development) along fertile years of a female and for some time beyond. Depending on the species and attributes of physical and psychological health, weight, environmental factors circadian rhythm, photoperiodism (the physiological reaction of organisms to the length of day or night), the effect of menstrual cycles reproductive function of the uterus is subject to hormone production, cell regeneration and other biological activities. Menstrual cycles may vary from a few days to six months, but can vary widely even in the same individual, often stopping for several cycles before resuming. Marsupials and monotremes do not have menstruation.
The uterus is mainly composed of smooth muscle, known as "myometrium." The innermost layer of the myometrium is known as the junction area, which becomes thicker in adenomyosis.
The loose connective tissue around the uterus.