Fine structure of the anal tonsilliar epithelium in the laboratory shrew (Suncus murinus)

Kazuyoshi Sakai, Genzoh Isomura

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4 Citations (Scopus)


The epithelium of the anal tonsil of the laboratory shrew was studied by scanning and transmission electron microscopy, with particular attention focused on the structure of the epithelium lining the anal tonsillar crypt. The tonsillar crypt surface is lined by two kinds of epithelia: squamous epithelium, which is located mainly at the neck of the crypt and includes keratohyalin granules in the superficial layer, and reticular epithelium, which is invaded by many immigrating cells and has several micropores immigrating cells to pass through. In addition, basal granulated cells are present in the basal layer. These results suggest that the reticular epithelium of the anal tonsil belongs to the well-developed gut-associated lymphoid tissue (GALT) in the alimentary canal. It represents a specialized and important compartment in immunological function, similarly to the palatine tonsils of other mammals, and has as yet unknown roles in digestion.

Original languageEnglish
Pages (from-to)25-32
Number of pages8
JournalOkajimas Folia Anatomica Japonica
Issue number1
Publication statusPublished - 05-2004

All Science Journal Classification (ASJC) codes

  • Anatomy


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