Topic 8: Membranes Flashcards
what are the four membrane types?
-mucous membranes
-serous membranes
-synovial membranes
-cutaneous membranes
what is the purpose of mucous membranes?
-lines the cavities of organs that open directly to the exterior of the body
what systems contain mucous membranes?
-digestive
-respiratory
-urinary
-reproductive
-called “the mucosa of the __________________ system”
what is the composition of mucous membranes?
-epithelial layer in contact with the organs lumen
-epithelium typically has many goblet cells
-loose areolar CT layer connecting the epithelium to the wall of the organ
what is the CT layer of mucous membranes called?
-lamina propria
what is the purpose of the CT layer in mucous membranes?
-to nourish epithelial cells (diffuses nutrients)
-provides support and connection
what is the purpose of serous membranes?
-lines closed cavities that do not open to the bodies exterior
-covers the external surfaces of organs within these cavities
what type of membranes are serous membranes?
-double membranes (2 layers)
-each layer has a simple epithelium layer connected to loose areolar CT
what are the 2 layers of serous membranes?
-outer parietal layer (against the cavity wall)
-inner visceral layer (against the organ)
what is between layers in serous membranes? what does the epithelium secrete into this?
-serous cavity
-secrete serous fluid (increases lubrication to decrease friction)
how are serous membranes named?
-named for location
-ex: pleura = lung (parietal pleura + visceral pleura)
-ex: peritoneum = abdominal organs (parietal peritoneum + visceral peritoneum)
-ex: pericardium = heart (parietal pericardium + visceral pericardium)
where are synovial membranes located?
-in joints
what makes synovial membranes different?
-composed of ONE tissue type
-no epithelium
-not considered an organ
what are synovial membranes composed of?
-loose areolar CT
where are cutaneous membranes located?
-in the skin
what are cutaneous membranes composed of?
-epithelium (stratified squamous named the epidermis)
-CT (areolar and dense irregular named the dermis)
what is the dorsal cavity?
-enclosed space containing/protecting the cranial cavity + vertebral cavity
-brain + spinal cord
what is the ventral cavity?
-enclosed space containing/protecting the thoracic cavity + abdominal cavity + pelvic cavity
what is contained within the thoracic cavity?
-pericardial cavity (heart)
-pleural cavity (lungs)
what is contained within the abdominal cavity?
-digestive organs
what is contained within the pelvic cavity?
-urinary bladder
-reproductive organs
-rectum
what is the determining factor of an organ?
-organs have 2 or more tissue types
-many contain all 4 types
what does a membrane generally contain? what is the purpose of a membrane?
-1 or 2 tissue types
-a connective tissue layer with or without an epithelial layer
-line inner and outer surfaces of the body and its organs
what are examples of cavities containing serous membranes?
-abdominal cavity
-thoracic cavity
