Abstract
AbstractA histochemical study of the mucus‐secreting cells in the epithelial lining of the alimentary tract of the ampullariid snail Marisa cornuarietis permits description of six types of glandular cells secreting carbohydrate‐rich substances. These mucous cells are designated on morphological grounds as fusiform, club‐shaped, ovate, goblet, saccular and elongated conical and their histology together with their distribution and relative frequency in the different organs is described.Histochemical analysis using various fixatives and numerous recently‐developed histochemical techniques shows that four main types of mucosubstances are produced by the six cell types. (1) The fusiform and club‐shaped cells secrete neutral mucosubstances with moderate‐to‐weak PAS reactivity and variable amounts of basic protein. (2) The ovate cells secrete a strongly PAS‐reactive, neutral mucosubstance lacking associated basic protein. (3) The goblet and saccular cells elaborate predominantly PAS‐unreactive, strongly acidic, and highly sulfated mucosubstances or sulfomucins. (4) The elongated‐conical cells secrete a highly PAS‐reactive, weakly acidic sulfomucin whose vic‐hydroxyls are presumably located in close proximity to sulfate esters.
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