Anatomy of diaphragmatic circulation

Area of Science:

• Anatomy and Physiology
• Cardiovascular System
• Respiratory System

Background:

• Understanding diaphragmatic vascularization is crucial for surgical and clinical interventions.
• Previous studies have provided limited detailed anatomical descriptions of the diaphragm's blood supply.
• The diaphragm's unique dual blood supply necessitates a comprehensive vascular mapping.

Purpose of the Study:

• To elucidate the detailed arterial and venous anatomy of the canine diaphragm.
• To identify key anastomoses and vascular patterns within the diaphragmatic musculature.
• To describe the venous drainage system and the role of valves.

Main Methods:

• Injection of acrylic coloring into the arteries and veins of the diaphragm in 48 mongrel dogs (10-35 kg).
• Detailed anatomical dissection and observation of vascular networks.
• Identification of arterial and venous anastomoses and their spatial relationships.

Main Results:

• Phrenic and internal mammary arteries form an internal arterial circle around the diaphragm tendon.
• Costophrenic arcades are formed by anastomoses between diaphragmatic branches and intercostal arteries.
• An arterial ring encircles the diaphragm's rib insertions, with similar venous drainage patterns and valves.

Conclusions:

• The diaphragm exhibits a complex, interconnected arterial supply via phrenic, internal mammary, and intercostal arteries.
• The identified vascular patterns, including costophrenic arcades and rings, highlight the diaphragm's rich blood supply.
• Venous drainage mirrors arterial distribution, with valves potentially regulating blood flow direction.