What is rete ridges?

Rete ridges, also known as rete pegs or rete processes, are structures found in the epidermis of the skin. They are extensions of the epidermal-dermal junction that project downward into the underlying dermis. Rete ridges serve to anchor the epidermis to the dermis, providing stability and support to the skin.

Rete ridges play a critical role in ensuring the integrity of the skin barrier by increasing the surface area of contact between the epidermis and the dermis. This increased surface area helps to prevent separation of the skin layers and promotes cohesion between them. Rete ridges also enhance the exchange of nutrients and waste products between the epidermis and the dermis.

The pattern and density of rete ridges can vary depending on the location on the body and individual factors such as age and genetics. Changes in rete ridge morphology can be seen in certain skin conditions, such as psoriasis and pemphigus, where there may be elongation or flattening of the ridges.

Overall, rete ridges are important structures in the skin that contribute to its resilience, strength, and function.