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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 large process bundle that runs along the vental mid-line extending from the ventral region of the nerve ring. |
ventral nerve cord
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ventral cord |
WBbt:0005829
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the most extensive region of neuropil in the animal, consists of a large toroidal bundle of processes. |
nerve ring
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circumpharyngeal nerve ring |
WBbt:0006749
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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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ganglion in the head. |
head ganglion
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WBbt:0005135
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ganglion anterior to the anus. |
preanal ganglion
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WBbt:0005448
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the ganglion that lies above and behind the rectum in the tail, in close continuity with the anal hypodermal ridge. It contains 3 neuron cell bodies (DVA, DVB and DVC) that send their neuronal processes into the ventral nerve cord via dorso-rectal commissures that encircle the anus. The ganglion contains no local neuropil in the hermaphrodite. In the adult male tail, this ganglion gains additional neurons and some local neuropil. |
dorso-rectal ganglion
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WBbt:0005212
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The left and right lumbar ganglia lie behind the pre-anal ganglion in the tail, in lateral positions. Each contains 12 neuron cell bodies that send most of their neuronal processes into the ventral nerve cord via lumbar commissures and the pre-anal ganglion. There is no local neuropil in these ganglia in the hermaphrodite, instead they form most synapses in the pre-anal ganglion. Most lumbar neurons have sensory functions. In the adult male tail, these two ganglia gain many additional neurons and have some local neuropil. The lumbar neurons lie in close association with the lateral hypodermis, and most are posterior to the anus. |
lumbar ganglion
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lumbar lateral ganglia |
WBbt:0005830
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