What is a defining feature of terminal hairs in relation to their pigmentation?

Terminal hairs are characterized by their morphological traits, including their thickness, length, and pigmentation. One defining feature of terminal hairs is that they are usually darker in color compared to other types of body hair, such as vellus hairs, which are softer and finer. This darker pigmentation is typically due to the density and size of the melanin granules present in the hair shaft, contributing to a more pronounced appearance compared to finer hair types. Additionally, terminal hairs are mostly found in areas such as the scalp, eyebrows, and during puberty, in regions like the face and underarms, further highlighting their distinctiveness in terms of color and visibility.

In this context, the darker pigmentation can be significant for the overall appearance and perception of hair in various parts of the body, differentiating terminal hairs from other hair categories. This aspect is essential in hair growth and development, influencing both aesthetic considerations and biological functions.