4-Zoology-Kinds-Chordate-Nervous System
main ganglion
Stem chordates have head as unique body segment, whose ganglion {main ganglion} provides unified control for all body segments and allows swimming, burrowing, and defense.
dorsal hollow nerve
Stem chordates have a tube of nerves down back {dorsal hollow nerve}, so all nerves have same pathway from head to periphery.
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Date Modified: 2022.0225