Membrane: Membrane is a thin layer of tissue that The function of covering a structure is called a membrane. It is spread over a surface or covers a cavity or organ. This membrane functions to prevent infection and injury. There are three main types of membranes in the body. which is as follows. 1. Mucous membrane: 2.Serous membrane.(Serous membrane): 3.Synovial membrane (synovial membrane): This membrane is located in the inner