PP1.H2.5 The Urethra

Urethra:

  • The urethra, in both males and females, is lined for the most part with stratified or pseudostratified columnar epithelium
  • The proximal part of the urethra in both sexes is transitional epithelium and the distal part is stratified squamous epithelium
  • Overall, the epithelial lining represents a progressive change from the waterproof (urine-proof) transitional (stratified) epithelium of the urinary system to the tough stratified squamous keratinising epithelium of the skin
  • It is not designed to resist wear and tear and can become damaged during catheterisation if care is not taken
  • After removal of a catheter, a damaged urethral lining may become fibrosed and cause constrictions leading to difficulties with urination
  • The female urethra has an indistinct muscular wall
  • The male urethra is surrounded by, and supported by, the erectile tissue of the penis

Micrograph of Male Urethra:

    Transitional Epithelium
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