<P> The vagina meets the outside at the vulva, which also includes the labia, clitoris and urethra; during intercourse this area is lubricated by mucus secreted by the Bartholin's glands . The vagina is attached to the uterus through the cervix, while the uterus is attached to the ovaries via the fallopian tubes . Each ovary contains hundreds of egg cells or ova (singular ovum). </P> <P> Approximately every 28 days, the pituitary gland releases a hormone that stimulates some of the ova to develop and grow . One ovum is released and it passes through the fallopian tube into the uterus . Hormones produced by the ovaries prepare the uterus to receive the ovum . The lining of the uterus, called the endometrium, and unfertilized ova are shed each cycle through the process of menstruation . If the ovum is fertilized by sperm, it attaches to the endometrium and the fetus develops . </P> <P> The development of the reproductive system and the development of the urinary system are closely tied in the development of the human fetus . Despite the differences between the adult female and male are derived from the intermediate mesoderm . The three main fetal precursors of the reproductive organs are the Wolffian duct, Müllerian ducts, and the gonad . Endocrine hormones are a well known and critical controlling factor in the normal differentiation of the reproductive system . </P> <P> The Wolffian duct forms the epididymis, vas deferens, ductus deferens, ejaculatory duct, and seminal vesicle in the male reproductive system and essentially disappears in the female reproductive system . For the Müllerian Duct this process is reversed as it essentially disappears in the male reproductive system and forms the fallopian tubes, uterus, and vagina in the female system . In both sexes the gonad goes on to form the testes and ovaries, because they are derived from the same undeveloped structure they are considered homologous organs . There are a number of other homologous structures shared between male and female reproductive systems . However, despite the similarity in function of the female fallopian tubes and the male epididymis and vas deferens, they are not homologous but rather analogous structures as they arise from different fetal structures . </P>

Give the names of four reproductive events that occur after puberty in human beings