Anatomy of the hair shaft and bulb. The word "hair" usually refers to two distinct structures: the part beneath the skin, called the hair follicle, or, when pulled from the skin, the bulb or root.

Hair is a filamentous structure made of keratin, a protein, that grows from follicles located in the skin. Each strand of hair consists of a shaft (the visible part above the skin) and a root …

4 days ago · A hair has a follicle below the skin, made of live cells, and a shaft above the skin made of dead cells. Hair grows through three phases: anagen, catagen, and telogen.

Nov 26, 2025 · Learn how hair is built from the inside out. This guide explains the layers of the hair shaft, the structure of the follicle, and the full hair growth cycle to help you understand how …

Jun 30, 2025 · A single strand of hair consists of two primary parts: the hair root and the hair shaft. The root is the portion located beneath the skin’s surface, anchored within a structure …

Dec 19, 2025 · The human hair is formed by divisions of cells at the base of the follicle. As the cells are pushed upward from the follicle’s base, they become keratinized (hardened) and …

Hair texture (straight, curly) is determined by the shape and structure of the cortex, and to the extent that it is present, the medulla. The shape and structure of these layers are, in turn, …