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Mention the location and drainage of seminal vesicle

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Seminal Vesicle - Location and Drainage

Location

The seminal vesicles are paired, elongated, hollow accessory glands of the male reproductive system. Each vesicle is 5-7 cm long and up to 1.5 cm wide (though the actual coiled tubule, when unraveled, measures ~15 cm in length).
Anatomical position:
  • Situated posterior to the urinary bladder and anterior to the rectum, at the base of the bladder
  • Each vesicle lies immediately lateral to the ampulla of the ductus (vas) deferens and follows its course at the bladder base
  • They lie posterior to the prostate, though slightly superior to it
  • They are oriented horizontally when viewed in the transverse plane on imaging
Development: Each seminal vesicle develops embryologically as a blind-ended tubular outgrowth from the ductus deferens. Its excretory duct joins the ampullary portion of the vas deferens to form the ejaculatory duct, which then courses through the prostate and opens into the prostatic urethra at the verumontanum.

Drainage

1. Venous Drainage

The venous drainage of the seminal vesicle follows the arterial supply, draining through the vesiculodeferential veins and the inferior vesical plexus into the pelvic venous plexus.

2. Lymphatic Drainage

Lymph from the seminal vesicle drains to the internal iliac (hypogastric) lymph nodes.

Blood Supply (for context)

The arterial supply arises from:
  • Internal iliac artery and inferior vesical artery via the prostatovesicular branch
  • Superior vesical artery via the vesiculodeferential artery (supplies the anterior surface near the tip)
  • Occasionally from the pudendal artery (variant)

Nerve Supply

  • Sympathetic: Fibers from the superior lumbar and hypogastric nerves
  • Parasympathetic: Via the pelvic plexus
Sources:
  • Campbell-Walsh-Wein Urology, Seminal Vesicle section (arterial supply, venous and lymphatic drainage)
  • Gray's Anatomy for Students, p. 549 (location relative to bladder, rectum, and ductus deferens)
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