Eyelashes and terminal scalp hairs are both types of hair that grow from the skin, but they differ in their length, structure, and function.
Length:
Eyelashes are significantly shorter than terminal scalp hairs. On average, eyelashes grow to a length of 10 to 12 millimeters (mm), while terminal scalp hairs can reach lengths of several centimeters. This difference in length is due to the different growth cycles of eyelashes and scalp hairs. Eyelashes have a shorter growth cycle, lasting about 6 to 8 weeks, compared to the scalp hair growth cycle, which can last for several years.
Structure:
Eyelashes have a different structure compared to terminal scalp hairs. Eyelashes are finer and thinner than scalp hairs. They also have a shorter shaft and a smaller diameter. The shorter shaft and smaller diameter of eyelashes make them less visible and less noticeable than scalp hairs.
Function:
Eyelashes serve a different function compared to terminal scalp hairs. Eyelashes are primarily responsible for protecting the eyes from dust, debris, and sweat. They also help to regulate the flow of tears and keep the eyes moist. Terminal scalp hairs, on the other hand, are involved in heat regulation and protection of the scalp from the sun’s ultraviolet (UV) rays.
In summary, eyelashes are shorter than terminal scalp hairs due to their shorter growth cycle, finer structure, and different function. Eyelashes are responsible for protecting the eyes, while terminal scalp hairs are involved in heat regulation and protection of the scalp.
