electroreceptor

The back of the body and head are brown, with white-pink scale margins and white electroreceptor pits.

These organs detect very small fluctuations in the potential difference between the pore and the base of the electroreceptor sack.

The electroreceptor organs in all these groups are derived embryologically from a mechanosensory system.

They consist of electroreceptor cells connected to the seawater by pores on their snouts and other zones of the head.

Knollenorgan is the name given to an electroreceptor found in the skin of weakly electric fish of the family Mormyridae from Africa.

In active electrolocation, the animal senses its surrounding environment by generating electric fields and detecting distortions in these fields using electroreceptor organs.

The ampullae detect electric fields in the water, or more precisely the difference between the voltage at the skin pore and the voltage at the base of the electroreceptor cells.

In freshwater, the resistance of the medium is higher than in saltwater, so the tube must channel voltage down a shorter path in order to have the same voltage reach the electroreceptor.

In the gymnotiform fish, Eigenmannia illustrated here, the primary sensory neurons in the electroreceptor system are simple feature detectors, and they include the ampullary receptors, probability coders (P units), and phase coders (T units).

A positive pore stimulus would decrease the rate of nerve activity coming from the electroreceptor cells, and a negative pore stimulus would increase the rate of nerve activity coming from the electroreceptor cells.