The arrector pili and epidermis are related only in that the action of the arrector pili causes "goosebumps" to form at the epidermis.
Sebaceous glands, errector pili, and hair are all accessory organs or appendages of the skin that are rooted in the dermis. The epidermis is a layer of the skin, and is on top of and separate from the dermis.
arrector pili.
Arrector pili is the muscle the raises hair. This is taught in health class.
involuntary
arrector pili
Follicles are composed of hair, sebaceous glands, and arrector pili muscles. The hair follicle is a tunnel-like segment of the epidermis that extends down into the dermis of the skin.
arrector pili
Within the hair follicles.
hair follicles
arrector pili
''goose bumps'' are formed
Arrector Pili Muscle