Seminal vesicle

The seminal vesicles are paired accessory sex glands of the male reproductive system. The seminal vesicle produces over two-thirds of the ejaculate and is very high in fructose. 

The seminal vesicle is actually a 10-15 cm long tubular structure but is coiled tightly so it only measures 4-5 cm in length. It is located superiorly and posteriorly to the prostate.

The excretory duct of the seminal vesicle unites with the ductus deferens to form the ejaculatory duct

Relations
  • sympathetic fibres from the testicular and hypogastric plexuses 4
Ultrasound
  • fluid-filled structure located posteriorly and superiorly to the prostate gland 2
CT
  • has a typical "bow-tie" appearance and soft-tissue density; located between the prostate and the bladder 2, 5
  • normally separated from the bladder by a fat plane
  • normally are less than 1.5 cm in diameter, beyond that they can be considerd dilated 5
  • according to one publication the mean length was estimated to be around 3 cm with the mean width at around 1.5 cm 6

  • they may be larger in those with autosomal dominant polycystic kidney disease 7

MRI
  • T1: low-to-intermediate signal
  • T2: convoluted areas of high signal representing seminal fluid and low signal walls 5
Abdominal and pelvic anatomy
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Article information

rID: 26087
System: Urogenital
Section: Anatomy
Tag: pelvis
Synonyms or Alternate Spellings:
  • Seminal vesicles
  • Seminal vesicle anatomy

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