The nervous system has cerebral ganglia which are linked to a double ventral nerve cord by a connecting ring.
The nervous system has cerebral ganglia which are linked to a double ventral nerve cord by a connecting ring.
神经系统有脑神经，它通过联接环与双股的腹神经索相连。
The nervous system has cerebral ganglia which are linked to a double ventral nerve cord by a connecting ring.
神经系统有脑神经，它通过联接环与双股的腹神经索相连。