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There is little attention given to the Carotid Body but it is the smallest organ at the size of a grain of rice.

The pineal gland--it's 8mm long in human bodies. It's located above the superior colliculus and behind and beneath the stria medullaris. It's also a part of the epithalamus.

An organ is a complex structure formed by 2 or more tissues. If we use this definition, then a corpuscle of touch (Meissner's corpuscle) would be an organ and much, much smaller than the pineal gland. A corpuscle of touch consists of nerve endings (dendrites) and a connective tissue covering. Another candidate for the smallest organ would be a taste bud, but I think corpuscles of touch would be smaller.

A more appropriate question might be, "What is the smallest organ that is part of the gross anatomy of the human body." The pineal gland might be the correct answer for this.

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