Human spinal cord (cross section) This is an example of nervous tissue. ... When there's a cluster of small dots, it could be either small blood vessels or nerve cells. ... body cavities, Bowman's capsule and respiratory spaces in lung. ... Cells are most dense at the inner layer (basal cells), ...
Also some other places like :- Fingertips, lips, and tongue.
"These receptors are also found in greater numbers on different parts of the body. For example, peoples' backs are the least sensitive to touch, while their lips, tongue, and fingertips are most sensitive to tactile activity. Most receptors for cold are found on the surface of the face while thermo receptors for warmth usually lie deeper in the skin and are fewer in number. A light breeze on the arm or head is felt because there tend to be more sense receptors at the base of the hairs than anywhere else."