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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 ...
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.
Sex differences in human physiology are distinctions of physiological characteristics associated with either male or female humans. These differences are caused by the effects of the different sex chromosome complement in males and females, and differential exposure to gonadal sex hormones during development.
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.
Two facing pages of text with woodcuts of naked male and female figures, in the Epitome by Andreas Vesalius, 1543. In Ancient Greece, the Hippocratic Corpus described the anatomy of the skeleton and muscles. [63] The 2nd century physician Galen of Pergamum compiled classical knowledge of anatomy into a text that was used throughout the Middle ...
Homologous structures in the external genitalia. This list of related male and female reproductive organs shows how the male and female reproductive organs and the development of the reproductive system are related, sharing a common developmental path. This makes them biological homologues. These organs differentiate into the respective sex ...
The body of the penis is suspended from the pubic symphysis. [7] It has two surfaces; the dorsal and the ventral or urethral.The penile raphe runs on its ventral surface.. The body is surrounded by a bi-layered model of tunica albuginea in which a distal ligament buttresses the glans penis and plays an integral role to the penile fibroskeleton, and the structure is called "os analog", a term ...
A lateral cutaway of the human male lower abdomen, showing the human male reproductive system anatomy. The internal male genitalia consist of the testicles, gonads that produce male gametes called sperm, the prostate, seminal vesicles, and bulbourethral glands, accessory glands that partake in sperm health, the epididymides, organs that store ...