CHAPTER 4
SKIN and BODY MEMBRANES
BODY MEMBRANES


Defined as the outermost edge, where
tissue interacts with the environment.
Environment could be the atmosphere,
ingested food or a body cavity.
BODY MEMBRANES (functions)




cover surfaces
-line body cavities
-form protective sheets around organs
- often lubricate organs
BODY MEMBRANES

1.
2.
2 TYPES OF BODY MEMBRANES
(described by tissue make up)
EPITHELIAL MEMBRANES
CONNECTIVE TISSUE MEMBRANES
EPITHELIAL MEMBRANES (3)
1. CUTANEOUS MEMBRANE- location- SKINCharacteristicsSuperficial EPIDERMIS is composed of a
keratinized stratified squamous epithelium.
 Underlying DERMIS is composed of dense
(fibrous) connective tissue.
 THIS IS THE ONLY DRY EPITHELIAL
MEMBRANE.
EPITHELIAL MEMBRANES (3)
2.
MUCOUS MEMBRANES- (mucosa)-location- This
membrane lines all the body cavities that are open to the
exterior. (respiratory, digestive, urinary)
Characteristics- various epithelium (simple squamous,
cuboidal, columnar) resting on LAMINA PROPRIA which
is some a loose connective tissue.
Epithelium of mucosae is adapted for absorption or
secretion. Most secrete mucus (except for lining of
urinary tract) and are considered WET MEMBRANES.
EPITHELIAL MEMBRANES
EPITHELIAL MEMBRANES (3)



3. SEROUS MEMBRANES- (serosa)-location
– line body cavities that are closed to the
exterior
Characteristicslayer of simple
squamous epithelium resting on a thin layer
of areolar connective tissue
Serosa produces SEROSA FLUID a clear
fluid – which allows organs to slide easily
across the cavity walls and other organs
because they produce
SEROUS MEMBRANES
SEROUS MEMBRANES


Serous membranes occur in pairs
PARIETAL LAYER – lines the walls of
the body cavities
VISCERAL LAYER- covers the organs
SEROUS MEMBRANES



IDENTIFIED BY LOCATIONPLEURA- serosa found around the
lungs
PERICARDIUM- serosa around the
heart
PERITONEUM- serosa around the
abdominal cavity
SEROUS MEMBRANESQUIZ TIME
1. Parietal pleura2. Visceral pleura3. Parietal peritoneum4. Visceral peritoneum5. Parietal pericardium6. Visceral pericardium-
CONNECTIVE TISSUE
MEMBRANES (1)
SYNOVIAL MEMRANES- locationsynovial joints- nearly all movable jointknee, elbow, etc
 Characteristics- made of soft areolar
connective tissue
 Provide a smooth surface and secrete
lubricating synovial fluids
SYNOVIAL MEMBRANE
SYNOVIAL MEMBRANE