Question

short note on nervous system in planarian
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Answer 1

Answer:

Planarians are considered to be among the most primitive animals which developed the central nervous system (CNS). ... The planarian CNS is located on the ventral side of the body, and composed of a mass of cephalic ganglions in the head region and a pair of ventral nerve cords (VNC).

Explanation:

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Answer 2

A planarian is a flatworm.

Explanation:

• Planarian belongs to the class Turbellaria.

• Planarian belongs to the order Tricladida (triclads).

• They are found under "rocks and debris in streams, ponds, and springs".

• Planarians can regenerate their lost body parts.

• Planarians have an enlarged "brain" called 'ganglion cell' and also have two eyes.

• Central Nervous System(CNS) is present in planarians.

• Two nerves (nerve cords) extending the length of the body can be found in planarians.

• The nervous system looks like a "ladder" because many transverse nerves are connected to the nerve cords.

• With the help of this ladder-like nervous system, the planarians can able to respond to stimuli.