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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
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gut |
WBbt:0005772
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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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body wall muscle in the head, including first eight cells of each muscle quadrants which are innervated by nerve ring neurons. |
head muscle
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head body wall muscle |
WBbt:0006761
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neuron with its cell body situated in the tail, posterior to rectum. |
tail neuron
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WBbt:0006759
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a bundle of nerve processes that runs along the dorsal mid-line of the animal. |
dorsal nerve cord
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dorsal cord |
WBbt:0006750
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