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A group of six equivalent cells forms a tightly constructed `valve` that links the posterior bulb of the pharynx to the anterior four cells of the intestine. These six cells comprise a small epithelial channel with a cuticular lining in continuity with the pharyngeal cuticle and link the lumen of the pharynx to the large lumen of the anterior intestine. |
pharyngeal-intestinal valve
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cardia |
WBbt:0005767
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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. |
intestine
|
gut |
WBbt:0005772
|
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a large process bundle that runs along the vental mid-line extending from the ventral region of the nerve ring. |
ventral nerve cord
|
ventral cord |
WBbt:0005829
|
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a bundle of nerve processes that runs along the dorsal mid-line of the animal. |
dorsal nerve cord
|
dorsal cord |
WBbt:0006750
|
|
ganglion in the head. |
head ganglion
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|
WBbt:0005135
|
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ganglion in the tail region (posterior to rectum). |
tail ganglion
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|
WBbt:0006977
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