5616 x 3744 px | 47,5 x 31,7 cm | 18,7 x 12,5 inches | 300dpi
Data acquisizione:
19 gennaio 2013
Altre informazioni:
Hair is a complex structure that is epidermal in origin. Animal hair is constructed out of proteins "composed of thousands of amino acids linked together in a highly organized arrangement and sequence" (Saferstein, 2002, p. 205). Hair is held in place below the epidermis by a root situated in a shaft surrounded by a hair follicle. The hair follicle consists of an epidermal and a dermal root sheath. One or more sebaceous glands also exist in the hair follicle and serve to secrete oil into the space between the shaft and the surrounding tissues. This oil lubricates the area and traps moisture, a function that benefits both the hair and the skin.
