Tzn

Sea anemone

(Cnidaria)

Segmental nerve

Ganglion in ventral nerve cord

Earthworm

(Annelida)

Ganglion in ventral nerve cord

Earthworm

(Annelida)

A nerve net serves simple behaviors such as contraction and relaxation.

In the earthworm, ganglia in each segment coordinate movement and an anterior "brain" controls more complex behavior.

"Brain'

Nerves to gut

"Brain'

Nerves to gut

-Visual ganglion

Ganglion

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Essentials of Human Physiology

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