what is the position of nervous system in planaria
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Planarians have cephalic ganglia (the brain), two ventral nerve cords, and many sensory neurons, which is present in center.
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(1) Planaria is a flatworm and belongs to the phylum Platyhelminthes.
(2) It is the most primitive animal with a Central Nervous System (CNS) located on the ventral side of body.
(3) Nervous system consists of a mass of cerebral or cephalic ganglion appearing like an inverted U-shaped brain.
(4) Ventrally from below the ganglia arise a pair of Ventral Nerve Cords (VNC) or long nerve cords. These are interconnected to each other by transfer nerve or commissure in a ladder like manner.
(5) The PNS include sensory cells arranged in lateral cords in the body.
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