Histochemical and Ultrastructural Characterization of the Posterior Esophagus of Bulla striata (Mollusca, Opisthobranchia)

• Type: Article in International Scientific Journal
• Date: 2010

Authors

lobo-da-cunha, a (Author) ICBAS; Oliveira, E (Author) Other; Ferreira, I (Author) Other; Coelho, R (Author) Other; Calado, G (Author) Other

Journal

Title: Microscopy and Microanalysis

Vol. 16 No. 6

Pages: 688-698

ISSN: 1431-9276

Publisher: Cambridge University Press

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 4 Citations

Other information

Authenticus ID: P-003-0QT

DOI: 10.1017/s1431927610093840

Abstract (EN): The posterior esophagus of Bulla striata, running from the gizzard to the stomach, was investigated with light and electron microscopy to obtain new data for a comparative analysis of the digestive system in cephalaspidean opisthobranchs. In this species, the posterior esophagus can be divided into two regions. In the first, the epithelium is formed by columnar cells with apical microvilli embedded in a cuticle. Many epithelial and subepithelial secretory cells are present in this region. In both, electron-lucent secretory vesicles containing filaments and a peripheral round mass of secretory material fill the cytoplasm. These acid mucus-secreting cells may also contain a few dense secretory vesicles. In the second part of the posterior esophagus, the cuticle is absent and the epithelium is ciliated. In this region, epithelial cells may contain larger lipid droplets and glycogen reserves. Subepithelial secretory cells are not present, and in epithelial secretory cells the number of dense vesicles increases, but most secretory cells still contain some electron-lucent vesicles. These cells secrete a mixture of proteins and acid polysaccharides and should be considered seromucous. The secretory cells of the posterior esophagus are significantly different from those previously reported in the anterior esophagus of this herbivorous species.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11