Question

short note on statocysts of Pila

Answer 1

Statocysts are the type of sensory organs present in the organism belonging to phylum arthropoda which help it to maintain the proper orientation with respect to gravity while moving.

Answer 2

The statocyst is a balance sensory receptor present in some aquatic invertebrates, including molluscs,[1] bivalves,[2] cnidarians,[3]ctenophorans,[4] echinoderms,[5]cephalopods,[6] and crustaceans.[7] A similar structure is also found in Xenoturbella.[8] The statocyst consists of a sac-like structure containing a mineralised mass (statolith) and numerous innervated sensory hairs (setae). The statolith's inertia causes it to push against the setae when the animal accelerates. Deflection of setae by the statolith in response to gravity activates neurons, providing feedback to the animal on change in orientation and allowing balance to be maintained.

In other words, the statolith shifts as the animal moves. Any movement large enough to throw the organism off balance causes the statolith to brush against tiny bristles which in turn send a message to the brain to correct its balance.

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