Here's a breakdown of the hair structure:
* Cuticle: The outermost layer, protecting the hair shaft and providing shine.
* Cortex: The middle layer, containing most of the hair's pigment and giving it its strength and elasticity.
* Medulla: The innermost layer, often absent in fine hair. It's a soft core that contributes to the hair's flexibility and can be used for identification purposes.
While the medulla is the innermost section, it's important to remember that it's not always present and its size and shape can vary depending on the hair type and individual.