| 21. | A hollow nerve cord is found in all chordates, including tunicates ( in the larval stage ).
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| 22. | The portion of the dorsal nerve cord in the collar region of Balanoglossus is the dorsal tubular nerve cord.
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| 23. | The portion of the dorsal nerve cord in the collar region of Balanoglossus is the dorsal tubular nerve cord.
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| 24. | The brains of arthropods and cephalopods arise from twin parallel nerve cords that extend through the body of the animal.
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| 25. | At least a pair of ventral nerve cords connect to the brain and run along the length of the body.
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| 26. | The main nerve cords of the central nervous system run through the length of the body from the pleural ganglia.
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| 27. | The nervous system is similar to that of other arthropods, including a ventral nerve cord with ganglia in each segment.
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| 28. | A layer of connective tissue called the neurolemma covers the brain, ganglia, major peripheral nerves and ventral nerve cords.
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| 29. | This behaviour is a reflex and does not require the CNS; it occurs even if the nerve cord is removed.
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| 30. | Because of the torsion of the nerve cords, one parietal ganglion is typically higher in the body than the other.
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