What is the mucosal membrane's location and gland presence?
It lines viscera and some organs, usually with mucus-secreting glands except in blood vessels and CNS lining.
What functions does the epithelium of the mucosal membrane perform?
Protection, absorption, secretion, and reabsorption.
What types of damage and threats does mucosal epithelial protection defend against?
Mechanical, thermal, osmotic damage, dust, viruses, bacteria, parasites, and partly immune defense.
What is the lamina propria and what does it contain?
Loose connective tissue beneath epithelium containing blood vessels, lymphatics, and nerve fibers.
What does interstitial connective tissue form in an organ?
The organ's external fibrous capsule.
What functions does the organ's external fibrous capsule provide?
It limits the parenchyma, shapes the organ, and reduces friction.
What does the stroma consist of in an organ?
Connective-tissue bands extending into the organ.
What pathways does the stroma provide inside an organ?
Pathways for blood vessels, lymphatics, and nerves.
What mechanical property does the stroma give to an organ?
Elasticity.
What does a serous membrane cover and line?
It covers internal organs and lines serous cavities.
What fluid does a serous membrane produce and absorb?
Serous fluid.
What properties reduce friction in serous fluid?
Buffering substances, mesothelial cells, and immune cells.
Which are the four serous cavities?
Right and left pleural, peritoneal, and pericardial cavities.
What are the three layers of a serous membrane?
Mesothelium, subepithelial loose connective tissue, and a proper serous layer of loose connective tissue.
What does the parietal serous lamina line?
The wall of a serous cavity.
What pain sensitivity characteristic does the parietal serous lamina have?
It is highly sensitive to pain.
What is a mesentery?
A double fold of serous membrane extending into a body cavity carrying vessels, lymphatics, and nerve fibers.
What bounds the thoracic cavity cranially?
The cranial thoracic aperture.
What bounds the thoracic cavity caudally?
The caudal thoracic aperture.
Where does the pleura begin in each pleural cavity?
At the lung hilus.
What does the pulmonary pleura cover?
The lung.
What are the components of parietal pleura?
Costal, mediastinal, and diaphragmatic pleura.
What does costal pleura line?
The inner thoracic wall.
What surface does diaphragmatic pleura cover?
The cranial surface of the diaphragm.
Which openings connect thoracic and abdominal cavities through the diaphragm?
Caval opening, esophageal hiatus, aortic hiatus, and lumbocostal arch.
Where is the costodiaphragmatic recess located?
Between costal and diaphragmatic pleura.
What fills the costodiaphragmatic recess during inspiration?
The lungs.
What defines the mediastinum anatomically?
It is the space between the right and left layers of mediastinal pleura.
Which major structures does the precardiac mediastinum contain?
Major vessels, sympathetic trunks and stellate ganglia, vagal and phrenic nerves, recurrent laryngeal nerves, thoracic duct, tracheal trunks, esophagus, and thymus in young animals.
What organs and vessels are found in the cardiac mediastinum?
Heart in pericardial sac, thoracic duct, esophagus, trachea, thymus, ascending aorta and aortic arch, pulmonary trunk and veins, azygos vein, major venae cavae, thoracic vessels, sympathetic trunks, vagal nerves, recurrent laryngeal nerves, and phrenic nerves.
What defines the peritoneal cavity's location?
It is the space within the peritoneal sac lining the abdominal cavity and contacting the transverse fascia externally.
Which structures bound the abdominal cavity cranially and caudally?
The diaphragm cranially and the terminal line caudally.
How does the abdominal cavity communicate with other cavities?
It communicates widely with the pelvic cavity and through three diaphragmatic openings with the thoracic cavity.
How does the peritoneal cavity differ between males and females?
It is completely closed in males but communicates with the external environment in females via the uterine tube and genital tract.
Which organs are contained within the peritoneal cavity?
The stomach, small and large intestines except retroperitoneal rectal segment and anal canal, liver, pancreas, spleen, and most urogenital organs.
What separates the pelvic cavity from the abdominal cavity?
The terminal line running from the sacral promontory along the arcuate lines to the pubic crest.
Which structures increase mucosal absorption?
Villi, microvilli, crypts, folds, and ridges.
What does mucosal epithelial secretion include and which cells perform it?
Mucus and digestive enzymes secreted by goblet cells and large glands beneath epithelium.
What roles does the lamina propria play in the mucosa?
Chemical transport, mechanical reinforcement, and immunity via lymphocytes and macrophages.
What immune structures can immune cells in the lamina propria form?
Solitary lymphatic nodules, tonsils, and Peyer’s patches.
Where do blood vessels and nerves enter an organ?
Through the hilus.
What happens to the stroma at the organ's hilus?
It continues into a mesentery.
What is the appearance of a serous membrane?
Shiny, smooth, transparent, and moist.
Where is the retroperitoneal space located?
An extraserous space behind the peritoneum.
Which organs are in the retroperitoneal space?
Both kidneys, ureters, and adrenal glands.
How are retroperitoneal organs covered by peritoneum?
Covered on only one side by peritoneum.
What tissues and structures does the subserous tissue contain?
Adipose tissue, blood and lymphatic vessels, and delicate nerve plexuses.
What sensations do the nerve plexuses in subserous tissue transmit?
Tactile, mechanical, thermal, and chemical sensations.
What is the function of primary mesenteries?
They provide routes for blood vessels, lymphatics, and nerve fibers.
What is the role of secondary mesenteries?
They maintain and stabilize internal organs.
Into which parts is mediastinal pleura divided?
Precardiac, cardiac, and post-cardiac pleura.
What structures pass through the esophageal hiatus?
Esophagus, vagal trunks, and esophageal vessels.
Which vessels and duct pass through the aortic hiatus?
Aorta, thoracic duct, azygos vein, and short azygos vein.
What does the lumbocostal arch transmit?
Visceral nerves and the sympathetic trunk from both sides.
Which structures are contained in the post-cardiac mediastinum?
Thoracic aorta, azygos vein, sympathetic trunks, greater and lesser splanchnic nerves, thoracic duct, dorsal and ventral vagal trunks, phrenic nerves, caudal vena cava, and internal thoracic arteries.
What lymph nodes compose the caudal mediastinal lymph center?
Cranial, middle, and caudal mediastinal lymph nodes.
Which species lack caudal mediastinal lymph nodes?
Dogs and cats do not have caudal mediastinal lymph nodes.
What nodes are included in the bronchial lymph center?
Right, left, and middle tracheobronchial nodes.
Name some fossae and excavations within the peritoneal cavity.
The vaginal process, pubovesical excavation, vesicogenital excavation, rectogenital excavation, and left and right pararectal fossae.
What artery enters the root of the mesentery and what does it support?
The cranial mesenteric artery enters the root of the mesentery, supporting organs suspended by mesenteries within the abdominal cavity.
Test your knowledge with 24 questions on Serous Membranes and Body Cavities.
1. Which structure is generally lined by a mucosal membrane?
2. What is the primary role of the epithelium in a mucosal membrane?
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