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Balanitis caused by smegma. Inflammation has many possible causes, including irritation by environmental substances, certain medications, physical trauma, and infection such as bacterial, viral, or fungal.
In therian mammals, the allantois (a hose-like structure also known as "allantoic duct") is one of the fetal membranes, and is part of and forms an axis for the development of the umbilical cord. While the function of the allantois remains conserved, there is a divergence in the characteristics of the allantois among mammalian species.
The International-Differences of Sex Development (I-DSD) is a research organization in Europe. This organization connects medical and research centers internationally in an effort to improve clinical practice, research, and general understanding of differences of sex development. [68]
Development of external genitals showing homologues from indifferent to both sexes - male on left When the fetus is exposed to testosterone , the genital tubercle elongates ( primordial phallus ) and develops into the glans and shaft of the penis and the urogenital folds fuse to become the penile raphe.
Diagram of stages of embryo development to a larval and adult stage. In developmental biology, animal embryonic development, also known as animal embryogenesis, is the developmental stage of an animal embryo. Embryonic development starts with the fertilization of an egg cell (ovum) by a sperm cell (spermatozoon). [1]
The development of the reproductive system is the part of embryonic growth that results in the sex organs and contributes to sexual differentiation. Due to its large overlap with development of the urinary system , the two systems are typically described together as the genitourinary system .
Penile-vaginal intercourse or vaginal intercourse is a form of penetrative sexual intercourse in human sexuality, in which an erect penis is inserted into a vagina. [1] Synonyms are: vaginal sex, cohabitation, coitus (Latin: coitus per vaginam), (in elegant colloquial language) intimacy, or (poetic) lovemaking.
The development of the gonads is part of the prenatal development of the reproductive system and ultimately forms the testicles in males and the ovaries in females. The immature ova originate from cells from the dorsal endoderm of the yolk sac. Once they have reached the gonadal ridge they are called oogonia.