Oct 14, 2014 - Human scalp hair is a bio-synthesized material that has a complex internal structure. The adult human hair is around 20–180 µm in width, and generally grows to a length of approximately 90 cm. It consists of many layers including the cuticle, the cortex and the medulla. Description. Each strand of hair is made up of the medulla, cortex, and cuticle. . Its complex structure slides as the hair swells and is covered with a single molecular layer of lipid that makes the hair repel water. The diameter of human hair varies from 0.017 to 0.18 millimeters (0.00067 to 0.00709 in). Mar 11, 2017 - Hair is made of a tough protein called keratin. A hair follicle anchors each hair into the skin. . In the hair bulb, living cells divide and grow to build the hair shaft. Blood vessels nourish the cells in the hair bulb, and deliver hormones that modify hair growth and structure at different times of life. The process of hair formation involves keratinization. Hair and its sheaths undergo keratinization at different speeds and with different modes. In the hair bulb, . Analysis and characterization of hair care products and their interaction with human hair has recently received considerable interest within the field of cosmetic . Jul 30, 2015 - Human hair structure has been studied extensively for more than 70 years, but a complete picture of its local structure has proven elusive. Jul 29, 2015 - Human hair structure has been studied extensively for more than 70 years, but a complete picture of its local structure has proven elusive. Jan 6, 2018 - Hair Structure - medulla, cortex, cuticle, hair shaft, sheath, matrix, . There are three main components to the human hair shaft. Each of these . Found below the skin, the hair root is contained in a tubelike structure called the hair . The average rate of human hair growth is about 1/100 of an inch per day.