The Structure of Hair | Learn What Hair Is Made From | Barber Lesson 105

Understanding Hair Structure and Its Importance

Overview of Hair Shaft Components

• The hair shaft is the visible part of hair, extending from the scalp and consists of three main parts: the cuticle, cortex, and sometimes the medulla.

• The cuticle is the outermost layer that acts as a protective shield for inner layers. It is translucent and made up of overlapping scale-like cells resembling roof tiles.

• The cortex is the thickest layer responsible for hair's strength, elasticity, and color. It contains keratin proteins whose arrangement determines hair's texture.

• Healthy hair can stretch up to 30% of its original length without damage; poor elasticity indicates potential damage from over-processing or heat.

• The medulla is a central core present in thick hair but absent in fine hairs; its exact function remains debated among scientists.

Understanding Hair Follicle Structure

• The hair follicle surrounds the hair root and includes the hair bulb where cell division occurs to form new hair shafts.

• Dermal papilla within the bulb supplies nutrients and blood to growing hair, essential for healthy growth.

• Sebaceous glands adjacent to follicles produce sebum, a natural oil that moisturizes both scalp and hair while providing shine and protection against environmental factors.

• An imbalance in sebaceous oil can lead to various issues such as oily or dry scalp conditions, dandruff, etc., which will be discussed in future lessons.

• Erector pili muscles connected to follicles cause goosebumps when contracted due to cold or emotional responses.

Significance of Hair Care