Sensory organs in animals

sensory system in fish and amphibians

tube located inside the ear

right|thumb|upright|Earwig with large cerci (top) Cerci (: cercus) are paired appendages usually on the rear-most segments of many arthropods, including insects and symphylans. Many forms of cerci serve as sensory organs, but some serve as pinching weapons or as organs of copulation. In many insects, they simply may be functionless vestigial structures.

sensory structure present in sharks

photoreceptive part of the epithalamus present in some animal species

hearing organ in insects, consisting of a membrane (tympanum) stretched across a frame backed by an air sac and associated sensory neurons

sensory organ in antennae

specialized paired sensory organs found in certain groups of myriapods and hexapods

thumb|Four trichobothria on the second leg of the spider Paratropis tuxtlensis Trichobothria (singular trichobothrium) are elongate setae ("hairs") present in arachnids, various orders of insects, and myriapods that function in the detection of airborne vibrations and currents, and electrical charge. In 1883, Friedrich Dahl observed that they were deflected by the sound waves from a violin and labelled them 'hearing hairs'.

natural bifurcation that occurs in some animals

stretch receptor organs