Covering and Lining Membranes

10/16/2008Covering and LiningMembranesTypes of membranes• Cutaneous- Is your skin.• Mucous- Lines body cavities that open tothe exterior.• Serous- Moist membranes found in closedventral body cavities.Cutaneous Membranes• An organ system consisting of keratinizedstratified squamous epithelium (epidermis)firmly attached to a thick layer of denseirregular connective tissue (dermis).• Unlike other epithelial membranes, thismembrane is exposed to the air and is dry.• Cutaneous membranes are thick, relativelywaterproof, and dry.1

10/16/2008Mucous Membranes• Lines body cavities that open to theexterior, such as those of the holloworgans of the digestive, respiratory, andurogenital tracts.• They are wet or moist membranes that arebathed by secretions.• The connective tissue portion of a mucousmembrane is called the lamina propria.Mucous Membrane continued…• The epithelial sheet is directly underlain bya layer of loose connective tissue calledthe lamina propria.• Are often adapted for absorption andsecretion.Serous Membranes• Moist membranes found in closed ventralbody cavities.• Consists of simple squamous epitheliumresting on a thin layer of loose connectivetissue.• Parietal lines the outer wall of the internalchamber. The visceral portion coversorgans within the body cavity.2

10/16/2008Hints to the word search• 1. Firmly attached to the connective tissue.• 2. Irregular connective tissue.• 3. An organ system consisting of a layer ofepithelium tissue.• 4. Wet or moist membrane.• 5. Found in closed ventral body cavities.• 6. Means “one own layer.”Sources• http://www.innvista.com/health/anatomy/membrane.htm3