Do Annelids Have Cephalization?

Annelids have a nervous system made of two ventral cords and one relatively large nervous cell concentration at its anterior portion, which resembles a primitive brain. ... Therefore, cephalization in annelids is greater than in nematodes or in flatworms

Does an earthworm have cephalization?

The nervous system of the earthworm is distributed through the segmented body, along a nerve core, which lends support to the claim that earthworms have no cephalization; however, one particular part of this nervous system, an enlarged ganglion, does act as a simple brain, and it is located in the anterior portion of ...

What organisms have cephalization?

Three groups of animals display a high degree of cephalization: vertebrates, arthropods, and cephalopod mollusks. Examples of vertebrates include humans, snakes, and birds. Examples of arthropods include lobsters, ants, and spiders. Examples of cephalopods include octopuses, squid, and cuttlefish.