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| Respond to outside stimuli; ie, light, sound. |
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| Respond to inner stimuli; ie, balance, limb position. |
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| A cell surface receptor protein. |
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| Specialized for acquiring information about the chemical environment and transmitting it to neurons. |
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| Chemoreceptors that respond to dissolved molecules. |
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| Chemoreceptors which respond to airborne molecules. |
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| Hollow hairlike projections of the cuticle; has a minute pore that allows stimulant molecules to reach the sensory cells. |
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| An olfactory organ lined by an olfactory epithelium; used to mediate chemical communication amoung animals of the same species. |
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| A set of external receptors present in fishes and amphibians based on hair cells; detects motion in the surrounding water. |
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| An accessory structure in which the kinocilia of several hair cells are embedded; beds the kinocilia when displaced. |
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| Organs that report the position and motion of the body with respect to gravity. |
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| The simplest organ evolved to detect an animal's position and acceleration wit respect to gravity; consists of a hollow fluid-filled cavity lined with mechanoreceptor cells that make contact with a statolith. |
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| An object made up of some dense material (sand grains, calcareous concretions, etc); stimulates receptor cells inside the statocyst. |
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| An organ of equilibrium; gives rise to the three semicircular canals of the inner ear. |
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| Mineralized concretions similar to statoliths associated with maculae. |
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