Anatomy and Embryology

, Volume 207, Issue 2, pp 169–175 | Cite as

The striated urethral sphincter in female rats

  • Christophe Praud
  • Philippe Sebe
  • Fabrice Mondet
  • Alain Sebille
Original Article


The aim of this study was to give a microscopic description of the organization, the innervation and the slow or fast type of the striated fibers of the external urethral sphincter in the female rat. Conventional methods for photonic microscopy and immunochemistry were applied to cross and longitudinal sections of snap-frozen urethra. With hematoxylin-eosin stained cross sections, striated fibers are of small diameter and attached directly to the surrounding connective tissue. They are innervated by cholinergic endplates as shown by acetylcholinesterase techniques and alpha-bungarotoxin binding. The histological aspects of the cross sections as well as the distribution of endplates along the length of the sphincter suggest an organization of the fibers in four bundles, possibly acting as a photographic diaphragm does. Like striated skeletal muscle fibers, the fibers bind monoclonal antibodies against dystrophin with subsarcolemmal distribution and against desmin which visualizes striations. All the fibers express fast myosin heavy chains and very few co-express slow myosin heavy chains as determined by immunocytochemistry. We are taking advantage of the diaphragmatic organization of the striated sphincter to develop a longitudinal section as a model of chronic incontinence to test the efficiency of grafted myoblasts provided by fast striated skeletal muscle.


Striated muscle fiber Neuromuscular junction Dystrophin Desmin Myosin heavy chain 



This study was supported by the Fondation de l'Avenir (grants ETO-0 and ETO-1 for AS). CP was granted by the Association Française contre les myopathies. The authors thank Nicolle Delphinefor technical assistance.


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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Christophe Praud
    • 1
  • Philippe Sebe
    • 2
  • Fabrice Mondet
    • 3
  • Alain Sebille
    • 1
  1. 1.Atelier de régénération neuromusculaireFaculté de Médecine St Antoine Paris Cedex 12France
  2. 2.Service d'Urologie Hôpital Tenon 4rue de la ChineParis Cedex 20France
  3. 3.Service d'UrologieGroupe Hospitalier Pitié Salpetrière Paris Cedex 13France

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