part_of part of part of composed primarily of lamina propria Wikipedia:Lamina_propria UBERON:0000030 lamina propria mucosa NCIT:C32918 FMA:62517 SCTID:298225002 BTO:0002330 A thin layer of loose connective tissue which lies beneath the epithelium and together with the epithelium constitutes the mucosa[WP]. The lamina propria contains capillaries and a central lacteal (lymph vessel) in the small intestine, as well as lymphoid tissue. Lamina propria also contains glands with the ducts opening on to the mucosal epithelium, that secrete mucus and serous secretions. tunica propria lamina propria mucosae mucosa epithelium organ component layer loose connective tissue