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These taste buds develop during fetal development. Adult pigs have up to 15,000 taste buds, a much larger number than the average human tongue, which has 9,000. [19] The dental anatomy of the fetal pig shows differences from adult pigs. The fetal pig develops primary teeth (which are later replaced with permanent teeth).
The urogenital opening is where bodily waste and reproductive fluids are expelled to the environment outside of the body cavity. In some organisms, including monotremes , [ 2 ] birds and some fish , discharge from the urological , digestive , and reproductive systems empty into a common sac called the cloaca .
The genitourinary system, or urogenital system, are the sex organs of the reproductive system and the organs of the urinary system. [1] These are grouped together because of their proximity to each other, their common embryological origin and the use of common pathways. Because of this, the systems are sometimes imaged together. [2]
As development proceeds, the intermediate mesoderm differentiates sequentially along the anterior-posterior axis into three successive stages of the early mammalian and avian urogenital system, named pronephros, mesonephros and metanephros respectively (anamniote embryos form only a pronephros and mesonephros). [2]
Henry Gray (1821–1865). Anatomy of the Human Body. 1918. 3. The Urogenital Apparatus; UNSW Embryology - Development of the Kidney and Reproduction Systems; How the Body Works / Sex Development / Sexual Differentiation / Duct Differentiation - The Hospital for Sick Children (GTA - Toronto, Ontario, Canada)
The nephrogenic cord is a portion of the urogenital ridge which is the source of much of the urinary system. [1] The nephrogenic cords are bilateral condensations of the intermediate mesoderm. [2] The cords extend from the cervical segments to the sacral segments of the embryo.
A.—Diagram of the primitive urogenital organs in the embryo previous to sexual distinction. * 3. Ureter. * 4. Urinary bladder. * 5. Urachus. * cl. Cloaca. * cp. Elevation which becomes clitoris or penis. * i. Lower part of the intestine. * ls. Fold of integument from which the labia majora or scrotum are formed. * m, m.
The prostate forms from the urogenital sinus and the efferent ducts form from the mesonephric tubules. For this, it is critical that the ducts are exposed to testosterone during embryogenesis . Testosterone binds to and activates androgen receptor , affecting intracellular signals and modifying the expression of numerous genes.