Identifier: 61131350R.nlm.nih.gov
Title: The dissector's guide, or, Student's companion : illustrated by numerous woodcuts, clearly exhibiting and explaining the dissection of every part of the human body
Year: 1837 (1830s)
Authors: Tuson, Edward William, 1802-1865 Lewis, Winslow, 1799-1875
Subjects: Anatomy, Regional Dissection
Publisher: Boston : Ticknor
Contributing Library: U.S. National Library of Medicine
Digitizing Sponsor: Open Knowledge Commons, U.S. National Library of Medicine

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may facilitate the passage of thesemen through the urethra. The urethra is the long elastic canal which conveys the urine fromthe bladder, and is divided into the parts described in the following dia-grams, which have been added to point out the relative positions ofsome of the parts described in the preceding page. 1. A posterior view of the bladder. 2. The fundus. 3. The body. 4. The cervix. 5. The ureters, descending to terminate at the posterior, inferior, andlateral parts of the bladder. 6. The vasa deferentia, terminating in 7. The vesiculee seminales. 8. The common union of each vas deferens and vesicula; seminales. 9. The situation of puncturing the bladder, where it is connected tothe rectum by cellular substance. 10. The prostate gland. 11. The urethra; its average length being about nine inches : dividinginto 12. The prostatic portion. 13. The membranous portion.- 14. The portion situated in the corpus spongiosum. 15. The bulb. ° 16. The orifice. tIie dissectors guide. 197
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17. The fossa naviculare. 18. The bladder and penis opened. 19. The termination of the ureters, 20. The trigon. 21. The caput gallinaginis. 22. The opening of the common union of the vesicula seminalis andvas deferens into the prostatic portion of the urethra. 23. The opening of the ducts of the prostate gland. 24. Cowpers glands. 25. The opening of Cowpers ducts into the urethra, 26. The openings of the lacunae. The average length of the urethra is about nine inches, the prostateportion occupying about three quarters of an inch, the membranousportion about an inch and a quarter, and the portion contained in the 17* 198 the dissectors guide. corpus spongiosum about seven inches. There are usually three dilata-tions of the urethra — one at the prostatic portion, one at the bulb, andone behind the orifice termed fossa naviculare; and there are gene-rally three contractions — one at the orifice, which is about the fifth ofan inch in diameter; one at the membranous portion, about a qu

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