Lecture Notes: Paritinium and Blood Supply to Digestive Organs

Introduction

• Overview of paritinium and blood supply in the digestive organs.
• Focus on the anchorage of GI tract organs and a cursory look at blood supply.

Paritinium

• Definition: Set of serous membranes providing anchorage for GI tract organs.
• Structure:
  • Contains two epithelial layers with fluidic connective tissue in between.
  • Visceral Side: Contacts organs (viscera = organ).
  • Parietal Side: Anchors to the body wall.
• Comparison with Other Serous Membranes:
  • Different from lung and heart serous membranes which have minimal fluid between layers.

Anatomy and Function

• Orientation Terms:
  • Posterior (Dorsal): Back side.
  • Anterior (Ventral): Front or belly side.
• Cross-section:
  • Visceral Paritinium: Lines GI tract.
  • Parietal Paritinium: Anchors to the body wall.
• Mesenteries:
  • Double layers of paritinium.
  • Serve as anchorage and pathways for blood vessels, lymphatics, and nerves.
  • Capable of fat storage and have roles in absorption and immune system.

Types of Organ Enclosure

• Intra-paritinal Organs:
  • Completely enclosed (e.g., stomach).
• Retroparitinal Organs:
  • Located behind the paritinium (e.g., much of the pancreas, duodenum).

Homeostatic Imbalances

• Peritonitis:
  • Inflammation of the paritinium.
  • Causes: Abdominal wound, perforating ulcer, ruptured appendix.
  • Response: Paritinium sticks together to localize infection.
  • Treatment: Debris removal, megadoses of antibiotics.

Blood Supply Overview

• Splanchnic Circulation: Blood supply branches off aorta.
  • Includes hepatic, splenic, left gastric, and mesenteric arteries.
• Hepatic Portal Circulation:
  • Nutrient-rich blood from intestines goes to the liver for processing.
  • Involves detoxification and reorganization.

Conclusion

• The paritinium serves crucial roles in anchoring GI organs and facilitating vascular connections necessary for nutrient processing and immune functions.