What is the middle layer of hair known as?

The middle layer of hair is known as the cortex, which plays a crucial role in determining the hair's strength, color, and texture. Comprising long, coiled proteins, the cortex is responsible for the hair's elasticity and overall health. It contains melanin, the pigment that gives hair its color, and the structure of the cortex influences how light reflects off the hair, impacting its shine.

The cortex is surrounded by the cuticle, which is the outer layer that provides protection. While the medulla is the innermost layer, not all hair types contain it, and the root is the part of the hair beneath the scalp. Understanding the anatomy of hair layers is important in cosmetology because it helps professionals cater to various hair types and conditions, leading to better treatments and styling methods.