Striated muscle in the cortex of foetal guinea-pig thymus.

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STRIATED muscle cells, referred to as “myoid” cells, have been described by light microscopists in the medulla of the thymus of a variety of vertebrates1. “Myoid” cells are rare, however, and most reports of the ultrastructure of the mammalian thymus make no mention of them. Van de Velde and Friedman identified “myoid” cells in a variety of mammals2,3 but did not show them in the normal mammalian thymus. They and others, however, showed electron micrographs of striated muscle in non-mammalian thymus and in a lymphoepithelial thymoma in a patient with myasthenia gravis3–5.