Peritoneal Cavity Flashcards
Is a serous membrane lined by mesothelial cells.
Peritoneum
Lines the abdominal and pelvic walls and the inferior surface of the diaphragm.
Parietal Peritoneum
What innervates Parietal Peritoneum?
somatic nerves:
- Central diaphragmatic: phrenic (C3-C5)
- Peripheral diaphragmatic: lower intercostal (7-12)
- subcostal (12)
- anterior abdominal wall: iliohypogastric (L1)
- ilioinguinal (L1)
Covers the viscera, is innervated by visceral nerves, and is insensitive to pain.
Visceral Peritoneum
What is parietal peritoneum sensitive to?
pain, temperature, touch, and pressure.
What innervates the parietal peritoneum in the pelvis?
Obturator nerve, a branch of the lumbar plexus
What is visceral peritoneum sensitive to?
only to stretch and tearing
What innervates visceral peritoneum?
Autonomic afferent nerves
What leads to the sensation of pain in viscera?
Overdistention of a viscus
What are the functions of peritoneum?
1-Secretion of peritoneal fluid to lubricate and glide mobile viscera easily on one another.
2-Peritoneal coverings of intestine tend to stick together in the presence of infection (to contain infection), remain localized by greater omentum which is called Watch dog or policeman of the abdomen.
3-Peritoneal folds (mesenteries) play an important part in suspending various organs within peritoneal cavity and serve as a means of conveying blood vessels, lymphatics, and nerves to these organs.
4- Large amounts of fat are stored in the peritoneal ligaments and mesenteries, and especially large amounts can be found in the greater omentum.
two-layered folds of peritoneum that connect solid viscera to abdominal walls. Liver is connected to diaphragm by falciform ligament, coronary ligament, and right & left triangular ligaments.
Peritoneal Ligaments
two-layered folds of peritoneum that connect stomach to another viscus.
Omenta: (omentum-single)
two-layered folds of peritoneum connecting parts of the intestines to posterior abdominal wall
Mesenteries
Support the viscera and provide pathways for associated neurovascular structures.
Peritoneal Reflections
Is a fold of peritoneum extending from the stomach to adjacent abdominal organs.
Omentum
Is a double layer of peritoneum extending from the porta hepatis of the liver to the lesser curvature of the stomach and the beginning of the duodenum.
Lesser Omentum
What consists the lesser omentum?
hepatogastric ligament
hepatoduodenal ligament
What run between the two layers of lesser omentum along the lesser curvature?
left and right gastric vessels
What is enclosed in the hepatoduodenal ligament?
A right free margin - PORTAL TRIAD:
- proper hepatic artery
- bile duct
- portal vein
What is between porta hepatis and superior aspect of 1st part of duodenum?
hepatoduodenal ligament
What is between the groove for ligamentum venosum and lesser curvature of stomach?
hepatogastric ligament
Hangs down like an apron from the greater curvature of the stomach, covering the transverse colon and other abdominal viscera.
Greater Omentum
Where is Greater Omentum derived?
embryonic dorsal mesentery
What runs in the greater omentum along the greater curvature?
right and left gastroepiploic vessels
What does greater omentum do in preventing the entrance of coils of the small intestine?
Plugs the neck of a hernial sac
Where does greater omentum adheres and wraps itself around the inflamed organs?
areas of inflammation
an inflammation of the peritoneum, characterized by an accumulation of peritoneal fluid that contains fibrin and leukocytes (pus)
Peritonitis
What are ligaments in greater omentum?
gastrolienal,
lienorenal,
gastrophrenic,
and gastrocolic ligaments.
Extends from the left portion of the greater curvature of the stomach to the hilus of the spleen and contains the short gastric and left gastroepiploic vessels.
Gastrolienal (Gastrosplenic) Ligament
Runs from the hilus of the spleen to the left kidney and contains the splenic vessels and the tail of the pancreas.
Lienorenal (Splenorenal) Ligament
Runs from the upper part of the greater curvature of the stomach to the diaphragm.
Gastrophrenic Ligament