What is the medulla in relation to hair structure?

The medulla is indeed the innermost part of the hair shaft. Understanding hair structure is crucial in fields like electrolysis and laser hair removal, as it relates to how hair growth and removal methods work. The medulla may not be present in all hair types, but when it is present, it consists of a soft core that can affect the overall characteristics of the hair, such as its thickness and texture.

In contrast, the outermost portion of the hair shaft is referred to as the cuticle, which acts as a protective layer. The protective outer layer is significant in maintaining the health and integrity of the hair, while the layer responsible for hair pigment is known as the cortex, which contains the melanin that gives hair its color. Recognizing the distinct roles and locations of these components within the hair structure helps in understanding the overall biology of hair and its response to various hair removal techniques.