A.​ Cutaneous membrane, or skin, is an organ system consisting of a keratinized squamous epithelium firmly attached to a thick layer of dense irregular connective tissue.
B.​ Mucous membranes line body cavities that open to the exterior and contain either stratified squamous or simple columnar epithelia.
C.​ Serous membranes consist of simple squamous epithelium resting on a thin layer of loose connective (areolar) tissue.

- Tissue repair occurs in two ways: regeneration and fibrosis.

- Three steps are involved in the tissue repair process:

1.​Inflammation prepares the area for the repair process.
2.​Organization restores the blood supply.
3.​Regeneration and fibrosis effect permanent repair.

Covering and Lining Membranes

1.​Primary germ layer formation is one of the first events of embryonic development.
a.​Ectoderm is the most superficial of the layers.
b.​Mesoderm is the middle layer.
c.​Endoderm is the deepest layer.