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  • Title: Microsporum canis scalp ringworm: its primary or secondary ectothrix character.
    Author: Vismer HF.
    Journal: Scanning Microsc; 1993 Jun; 7(2):671-6. PubMed ID: 8108682.
    Abstract:
    This study supports the view that, in cases of tinea capitis due to a Microsporum canis infection, ectothrix arthroconidium formation is extrapilary and arises from intrapilary hyphae. The hyphae of M. canis perforate and digest the hair cuticle to alter its appearance from a normally identifiable structure of imbricated cells with a distal free border, to a grossly altered and pathological layer. Conidium production mainly takes place outside the hair shaft and forms thick clusters between the cuticular tiles. Finally, a shaft of conidia is formed around the hair. The cuticular covering of such a conidium sheath belongs to the root sheath of the hair follicle, and not to the hair structure proper.
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