What is the correct definition of an ommatidium?

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A segment of the ventral nerve cordThe basic functional component of a compound eyeA sensory receptor involved in detecting body positionThe lower section of an insect's brain

Explanation

An ommatidium is the fundamental visual unit that makes up the compound eye in insects and other arthropods, allowing them to detect images. It is not related to the nervous system subdivisions or mechanoreceptors for proprioception.