Corpus luteum does not degenerate and progesterone levels remain high
Corpus luteum
Develops from the follicle after ovulation and secretes progesterone
FSH
Develops follicle and production of oestrogen by follicle in the follicular phase of the uterus endometrium
LH surge
Triggered by peak levels of oestrogen, triggers ovulation
Luteal phase
Second half of the menstrual cycle when the corpus luteum is present
The menstrual cycle takes approximately 28 days
Progesterone
Produced by the corpus luteum, promotes further development and vascularisation of the endometrium preparing it for implantation if fertilisation occurs
Follicular phase
First half of the menstrual cycle where the follicle develops
Oestrogen
A hormone produced by the ovary that stimulates proliferation of the endometrium
Lack of progesterone
Leads to degeneration of corpus luteum with a subsequent drop in progesterone levels which leads to menstruation
