Which mechanoreceptors are found where tactile sensitivities are extremely well developed, and are common at the eyelids, lips, fingertips, nipples, and external genitalia?

The correct answer is - Meissner's corpuscles.

Explanation:

The Meissner's corpuscles are the mechanoreceptors are present in skin at various place in the skin such as eyelids, nipple, fingertips, and genitalia that are extremely well-developed sensitivities for light touch or vibration.

The Meissner's corpuscles are discovered by George Meissner and Rudolf Wagner. These receptors also called tactile corpuscles that are basically a type of nerve ending that is very sensitive to vibration and light touch.

Thus, the correct answer is - Meissner's corpuscles.