Final answer:
Tactile discs, or Merkel's disks, are primary tactile mechanoreceptors found in the skin. They respond to light touch and are highly sensitive to edges.
Step-by-step explanation:
Tactile discs, also known as Merkel's disks, are primary tactile mechanoreceptors found in the upper layers of the skin near the base of the epidermis. They are densely distributed in the fingertips, palms, and lips, and respond to light touch. Tactile discs are slow-adapting encapsulated nerve endings that allow for the pinpointing of a stimulus and are finely sensitive to edges.