Planaria

References

Images

Diagram of the flatworm Planaria showing its nervous system, including labeled cerebral ganglia, longitudinal nerve cords, transverse commissures, and peripheral nerve plexus. An inset shows the flatworm's overall shape.

Diagram comparing the nervous systems of a flatworm (Planaria) and a grasshopper, showing labeled nerve cords, nerve clusters, and nerves in both organisms, with the brain indicated in each.

Planaria

flatworm genus

Also known as: Crenobia

Written by

The Information Architects of Encyclopaedia Britannica

Learn about this topic in these articles:

nervous system
Simple bilateral systems
…a free-living flatworm such as Planaria consists of a brain, longitudinal nerve cords, and peripheral nerve plexuses (interlacing networks of peripheral nerves; from Latin plectere, “to braid”). The brain, located in the anterior portion of the animal, is composed of two cephalic ganglia joined by a broad connection called a…
Read More
…a free-living flatworm such as Planaria consists of a brain, longitudinal nerve cords, and peripheral nerve plexuses (interlacing networks of peripheral nerves; from Latin plectere, “to braid”). The brain, located in the anterior portion of the animal, is composed of two cephalic ganglia joined by a broad connection called a…
Read More

planarian
Planaria is the name of one genus, but the name planarian is used to designate any member of the family Planariidae and related families.
Read More
Planaria is the name of one genus, but the name planarian is used to designate any member of the family Planariidae and related families.
Read More