Final answer:
The receptors responsible for sensing crude and persistent touch are the Pacinian corpuscles and Ruffini endings, which are located in the deeper layers of the skin.
Step-by-step explanation:
The receptors responsible for sensing crude and persistent touch are primarily the Pacinian corpuscles and Ruffini endings. Pacinian corpuscles are specialized to sense deep pressure and vibration, while Ruffini endings detect stretching and sustained pressure. These receptors are located in the deeper layers of the skin, allowing them to respond to more substantial and lasting touch stimuli compared to receptors that sense light touch, such as Meissner's corpuscles and Merkel's disks.
Overall, our sense of touch involves a complex system of nerve endings and touch receptors that work together to convey different tactile experiences. The skin's dermis houses these receptors and is responsible for sending the appropriate nerve impulses to the brain, which then interprets them as different sensations like texture, warmth, or pain. The integration of signals from these mechanoreceptors provides us with a refined sense of touch.