Abstract
The bladder mostly derives from the mesoderm. The partition of the cloaca by the urorectal septum takes place between the 4th and 7th weeks. Producing the primitive urogenital sinus ventrally and the anorectal canal dorsally. The primitive urogenital sinus undergoes further division into a cranial vesical part that is continuous with the allantois, a middle pelvic part, and a caudal phallic part. The bladder mainly arises from the vesical part and the trigone develops from the caudal ends of the mesonephric ducts which connect to the posterior bladder wall. The middle pelvic part of the primitive urogenital sinus will give rise to the bladder neck, the male prostatic urethra, and the entire female urethra. The urachus develops from the allantois’ anterior portion [1–4] (Fig. 19.1).
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Notes
- 1.
The Onuf’s nucleus is named after the American Neurologist Bronislaw Onuf Onufrowicz (1863–1928), who first discovered it in New York in 1899.
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AL-Mamari, S.A. (2023). Anatomy of the Urinary Bladder. In: Urogenital Trauma: A Practical Guide. Springer, Singapore. https://doi.org/10.1007/978-981-99-6171-9_19
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