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Lamina propria

Recommended video: Loose connective tissue [10:11]
Structure and cellular components of loose connective tissue.

Lamina propria is an areolar connective tissue layer present in all mucous membranes found in the body. It is found underneath the epithelium attaching to the basal surface of the basal membrane, and depending on the location of the mucosa, it may be sitting on top of a deeper third muscular layer (muscularis mucosae), for example in the mucosa of the gastrointestinal tract.  

The lamina propria is richly vascularized, providing nutrients to the epithelium as well as mechanical support, helping to anchor the epithelium to the deeper tissues. Within its connective tissue matrix, it is possible to find an array of different cell types, including T and B lymphocytes, macrophages, fibroblasts, plasma cells as well as different types of glands. Due to the presence of these immune cells, as well as providing a physical barrier to external pathogens, the lamina propria also has an immune response function. 

Terminology English: lamina propria
Latin
: lamina propria
Location Beneath the epithelium of mucosal membranes.  
Function -Nutrition and structural support for epithelium.
- Immunity: physical barrier against pathogens, presence of immune cells 

Learn more about loose connective tissues in this study unit: 

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