atrichoblast

Atrichoblast is a type of hair follicle found in the skin of mammals, including humans. It is characterized by the absence of a hair shaft, which is the visible part of the hair. Instead, atrichoblasts are composed of a single layer of keratinocytes that form a thin, flat structure. These follicles are typically found in areas of the skin where hair growth is not required or desired, such as the palms of the hands, soles of the feet, and mucous membranes.

Atrichoblasts play a crucial role in the skin's protective barrier and moisture retention. They help to prevent water loss and protect the underlying tissues from external damage. Additionally, atrichoblasts contribute to the skin's tactile sensitivity, as they are densely packed and can detect pressure and touch.

The structure of atrichoblasts is relatively simple compared to other types of hair follicles. They lack the complex layers of cells and structures found in trichoblasts, which are responsible for hair growth. Instead, atrichoblasts consist of a single layer of keratinocytes that are tightly packed together.

Atrichoblasts are also found in other mammals, such as rodents and primates, and their distribution and function may vary depending on the species. In some cases, atrichoblasts may be associated with specialized functions, such as the production of sebaceous glands or sweat glands.

In summary, atrichoblasts are a type of hair follicle characterized by the absence of a hair shaft. They play a crucial role in the skin's protective barrier and moisture retention, and their distribution and function may vary depending on the species.