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At six weeks post-conception, the differentiation of the external genitalia in the male and female has not taken place. At eight weeks, a distinct phallus is present during the indifferent stage. By the 10th-12th week, the genitalia are distinctly male or female being and derived from their homologous structures. At 16 weeks post-conception ...
In human anatomy, the penis (/ ˈ p iː n ɪ s /; pl.: penises or penes; from the Latin pēnis, initially "tail" [1]) is an external sex organ (intromittent organ) through which males urinate and ejaculate. Together with the testes and surrounding structures, the penis functions as part of the male reproductive system.
Articles relating to the human penis, an external male sex organ (intromittent organ) that additionally serves as the urinary duct.The main parts are the root, body, the epithelium of the penis including the shaft skin, and the foreskin covering the glans.
Despite the differences between them, the adult male and female are determined in early development in the 6th week. The gonads and external genitals are derived from the intermediate mesoderm. [7] The three main fetal precursors of the reproductive organs are the Wolffian duct, the Müllerian ducts, and the gonads.
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The outer parts are known as the genitals or external genitalia, visible at birth in both sexes, [1] while the inner parts are referred to as internal genitalia, which in both sexes, are always hidden. [2] In plants, male reproductive structures include stamens in flowering plants, which produce pollen. [3]
The male external genitalia include the penis and the scrotum. The female external genitalia include the clitoris , the labia , and the vestibule , which are collectively called the vulva . External genitalia vary widely in external appearance among different people.
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