👉 The wall fluid, also known as the basal lamina fluid or interstitial fluid, is a thin layer of fluid that surrounds and supports cells within the extracellular matrix, particularly in connective tissues. This fluid is crucial for maintaining tissue structure and function by facilitating cell adhesion, migration, and communication. It also plays a role in nutrient and waste exchange between cells and the surrounding environment. The wall fluid is generated by the movement of cells within the matrix and is influenced by factors such as cell activity, tissue growth, and mechanical forces. This dynamic fluid environment ensures that cells remain properly positioned and function correctly within their tissue context.