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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 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
|
cardia |
WBbt:0005767
|
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Epidermal layer. |
hypodermis
|
epidermis |
WBbt:0005733
|
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neuron with its cell body situated in the head, excluding the pharynx. |
head neuron
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WBbt:0006751
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intestinal muscle cell, attach to intestine and body wall anterior to anus |
intestinal muscle
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stomato-intestinal muscle |
WBbt:0005796
|
