Acta Neuropathologica

, Volume 60, Issue 3–4, pp 278–282 | Cite as

Fiber types in the striated urethral and anal sphincters

  • H. D. Schrøder
  • E. Reske-Nielsen
Original Works


Seven normal human striated urethral and anal sphincters obtained by autopsy were examined using histochemical techniques. In both the urethral sphincter and the subcutaneous (s.c.) and superficial part of the anal sphincter a characteristic pattern with two populations of muscle fibers, abundant connective tissue, and numerous intramuscular nerves are seen. No spindles are observed. The muscle fibers, particularly the predominant type 1 fibers are very small (about 15 μm in diameter). The fiber characteristics of the sphincters indicate that these muscles have a capacity to produce sustained contractions and to react in stress conditions with fast increase in tension.

Key words

Striated pelvic sphincters Enzyme histochemistry 


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Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • H. D. Schrøder
    • 1
  • E. Reske-Nielsen
    • 1
  1. 1.Dept. of Neuropathology, Aarhus KommunehospitalUniversity of AarhusAarhus CDenmark

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