1. Epithelial Membranes: These membranes are composed of epithelial tissue and an underlying layer of connective tissue. They are further classified into:

* Cutaneous Membrane (Skin): The outermost membrane, composed of stratified squamous epithelium and a thick layer of dense connective tissue called the dermis.

* Mucous Membranes: Line body cavities that open to the exterior, such as the digestive, respiratory, urinary, and reproductive tracts. They are composed of epithelial tissue and a layer of loose connective tissue called the lamina propria.

* Serous Membranes: Line closed body cavities and cover the organs within them. They are composed of simple squamous epithelium and a thin layer of loose connective tissue.

2. Connective Tissue Membranes: These membranes are composed of various types of connective tissue, but lack epithelial tissue. The only example is:

* Synovial Membranes: Line the cavities of freely movable joints (synovial joints). They are composed of specialized connective tissue that secretes synovial fluid, which lubricates the joint.

Therefore, the two major categories of body membranes are epithelial membranes and connective tissue membranes.