👉 Crenulae, also known as crenulate cells, are specialized epithelial structures found in the skin and other connective tissue that form a protective barrier against pathogens and irritants. They help to maintain the integrity of the skin by preventing the release of harmful substances into the bloodstream. Crenularia are responsible for protecting the skin from damage caused by external stimuli such as sunlight, ultraviolet radiation, or chemical agents, thus ensuring its overall health and function.