| Penile embryology and anatomy. | |
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MedLine Citation:
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PMID: 20602076 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Knowledge of penile embryology and anatomy is essential to any pediatric urologist in order to fully understand and treat congenital anomalies. Sex differentiation of the external genitalia occurs between the 7th and 17th weeks of gestation. The Y chromosome initiates male differentiation through the SRY gene, which triggers testicular development. Under the influence of androgens produced by the testes, external genitalia then develop into the penis and scrotum. Dorsal nerves supply penile skin sensation and lie within Buck's fascia. These nerves are notably absent at the 12 o'clock position. Perineal nerves supply skin sensation to the ventral shaft skin and frenulum. Cavernosal nerves lie within the corpora cavernosa and are responsible for sexual function. Paired cavernosal, dorsal, and bulbourethral arteries have extensive anastomotic connections. During erection, the cavernosal artery causes engorgement of the cavernosa, while the deep dorsal artery leads to glans enlargement. The majority of venous drainage occurs through a single, deep dorsal vein into which multiple emissary veins from the corpora and circumflex veins from the spongiosum drain. The corpora cavernosa and spongiosum are all made of spongy erectile tissue. Buck's fascia circumferentially envelops all three structures, splitting into two leaves ventrally at the spongiosum. The male urethra is composed of six parts: bladder neck, prostatic, membranous, bulbous, penile, and fossa navicularis. The urethra receives its blood supply from both proximal and distal directions. |
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Authors:
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Jenny H Yiee; Laurence S Baskin |
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Publication Detail:
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Type: Journal Article; Review Date: 2010-06-29 |
Journal Detail:
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Title: TheScientificWorldJournal Volume: 10 ISSN: 1537-744X ISO Abbreviation: ScientificWorldJournal Publication Date: 2010 |
Date Detail:
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Created Date: 2010-07-05 Completed Date: 2010-08-16 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101131163 Medline TA: ScientificWorldJournal Country: England |
Other Details:
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Languages: eng Pagination: 1174-9 Citation Subset: IM |
Affiliation:
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Department of Urology, University of California San Francisco, USA. yieejh@urology.ucsf.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Humans Male Penis / anatomy & histology*, embryology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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