Endocrine cells in the gut of the ascidian Styela clava

Cell and Tissue Research
M C Thorndyke, P J Bevis

Abstract

Ultrastructural studies have shown the presence of two types of granulated endocrine cell in the gut of Styela clava. Type I, which occurs in the stomach and intestine contains small irregular granules, each with a distinct halo. Type II, found only in the oesophagus contains larger rounded granules, often with little or no halo. The characteristics of these two cell types are compared with those of endocrine cells found in the digestive tracts of other protochordates and discussed with special reference to the evolution of gastrointestinal endocrine cells in vertebrates.

Related Concepts

Metazoa
Gastrointestinal System
Esophagus
Structure of Intestinal Gland
Intestines
Electron Microscopy
Stomach
Ascidia

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