The lamina propria is a layer below the epithelium of organs, skin, and lumens that acts as a supporting layer that holds the epithelium in place. The lamina propria is a network of loose connective tissue made up of reticular fibres, collagen, and elastic fibres. These fibres hold the epithelium to the underlining sub mucosa. Collectively, the epithelium and the lamina propria make up the mucosa. The lamina propria layer also contains blood vessels (arterioles, veins, and capillaries), fibroblasts, nerve fibres, lymphoid tissue and depending on its location, may be connected to a muscle layer (e.g, vocalis muscle in the larynx). In the vocal fold it is divided into three distinguishable layers: superficial lamina propria, intermediate lamina propria and deep lamina propria.
Lamina propria RS_admin