Nerves Unmyelinated and myelinated sensory nerves are present in the dermis. Free nerve endings penetrate into the epidermis. In addition, there are specialized sensory structures containing myelinated fibers which mediate the sensation of touch. They are called Meissner's corpuscles. The special structures that mediate pressure are called Pacinian corpuscles.
Motor nerves innervate the blood vessels, sweat glands and the arrector pill muscle.
The latter is a smooth muscle which arises in the connective tissue and inserts into the hair follicle. Epidermal appendages during fetal development, specialized epithelialderived structures develop from the epidermis, towards the dermis. These structures are called epidermal appendages. Each performs a special function in the skin. Sebaceous Gland - Sebaceous glands are found everywhere on the human skin except on the palms, soles and dorsa of feet.