Sensillum
Sensillum, plural sensilla, is a small sensory organ found in arthropods, especially insects and crustaceans. A sensillum consists of a cuticular projection that houses one or more sensory neurons together with supporting cells, often with an external pore or opening to the environment. The arrangement allows environmental stimuli to be transduced into neural signals that reach the central nervous system.
Based on morphology and function, sensilla are commonly categorized as mechanosensory or chemosensory. Classical insect classes
Distribution is broad but concentrated on sensory appendages such as antennae, mouthparts, legs, and wings, where
Developmentally, sensilla arise from epidermal cells that form cuticular outgrowths, with sensory neurons extending dendrites into