ISSN:
0362-2525
Keywords:
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Biology
,
Medicine
Notes:
A 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.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jmor.1051350206
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