Expression is seen from 3-fold embryo stage until adulthood. Expression is highly mosaic and seen in a number of cells and tissues. The most common components consist of diffuse expression in the intestine (particularly of young larvae), and in anal muscle cells. Expression is also occasionally seen in the excretory cell and canals, the vulval hypodermis, the pharynx, and hypodermal cells.
Primary Identifier
Expr2033
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A chain of very large cuboidal cells forming a wide central lumen in which food arrives from the posterior pharynx, is digested, and from which waste products proceed to the rectum. Intestinal rings form in groups of two and four cells surrounding the common lumen; thus the epithelium is only one cell deep at any point, with neighboring cells firmly secured to their neighbors by apical adherens junctions. These cells have very large nuclei and many large vacuoles, yolk granules, and other inclusions; the latter increase in number and electron density as the animal ages.
the feeding organ, a neuro-muscular pump in the head of the animal, used to ingest food, bacteria suspended in liquid, filter them out, grind them up and transport posteriorly into the instestine.
a single, H-shaped cell which lies just above the anus and connects the roof of the anal canal to the dorsal bodywall; its contractions act to increase the size of the anal opening by lifting the roof of the rectum and hence facilitate expulsion of intestinal contents.
