The integumentary system is the physical system that forms the barrier between the external environment and the internal systems of the body. In humans, this system consists of skin, hair, nails, and ...

Medically reviewed by Brendan Camp, MD Key Takeaways The skin is the body's largest organ and helps protect internal organs ...

Researchers at the School of Medicine at the University of California, Riverside have discovered previously unrecognized immune surveillance structures in the skin. Found within hair follicles, the ...