Celiac Trunk

Introduction

Overview of the Celiac Trunk

The celiac trunk is the first major ventral branch of the abdominal aorta, arising at the T12 vertebral level. It supplies the foregut and gives rise to three classic branches: the left gastric, splenic, and common hepatic arteries. Understanding its position is essential for navigating the upper abdominal neurovascular landscape.

Neurovascular Relationships in the Upper Abdomen

The celiac trunk is closely associated with the celiac (solar) plexus, a dense network of sympathetic and parasympathetic fibers that accompany the arterial branches. Venous drainage converges into the portal system via the splenic and hepatic veins. These relationships influence both surgical approaches and disease presentations.

Study

Anatomy of the Celiac Trunk

The trunk originates from the anterior surface of the abdominal aorta, typically measuring 1–2 cm in length before bifurcating. Its three primary branches are the left gastric artery (supplying the lesser curvature of the stomach), the splenic artery (running along the pancreas to the spleen), and the common hepatic artery (giving rise to the proper hepatic and gastroduodenal arteries). Variations such as a hepatosplenic trunk or a replaced common hepatic artery occur in up to 20% of individuals.

Major Arterial Branches and Their Visceral Targets

The left gastric artery descends to the stomach and contributes to the esophageal arterial supply. The splenic artery follows a tortuous course, providing branches to the pancreas, greater curvature of the stomach, and spleen. The common hepatic artery gives rise to the proper hepatic artery, which supplies the liver, and the gastroduodenal artery, which supplies the duodenum and pancreas.

Venous Drainage Associated with the Celiac Plexus

Veins accompanying the celiac branches drain into the portal venous system: the left gastric vein joins the portal vein, the splenic vein merges with the superior mesenteric vein to form the portal vein, and the hepatic veins drain directly into the inferior vena cava after passing through the liver. These venous pathways are critical for the hepatic portal circulation and for understanding variceal formation in portal hypertension.

Autonomic Innervation: Celiac Plexus

The celiac plexus receives pre‑ganglionic sympathetic fibers from the thoracic splanchnic nerves (T5–T12) and parasympathetic fibers from the vagus nerve. Fibers travel along the arterial branches, providing visceral motor and sensory innervation to the stomach, liver, pancreas, and spleen. Blockade of this plexus is a therapeutic option for upper abdominal pain, especially in pancreatic cancer.

Clinical Significance of Celiac Trunk Variations

Anatomical variations can affect surgical planning, endovascular interventions, and the risk of ischemic complications. For example, a replaced right hepatic artery arising from the superior mesenteric artery may be vulnerable during pancreaticoduodenectomy. Awareness of these patterns reduces intra‑operative injury and improves postoperative outcomes.

Summary

Key Takeaways

The celiac trunk is the principal arterial supply to the foregut, giving rise to the left gastric, splenic, and common hepatic arteries. It is enveloped by the celiac plexus, which carries both sympathetic and parasympathetic fibers, and its venous counterparts drain into the portal system. Recognizing common anatomical variations is essential for safe abdominal surgery and endovascular procedures.

Clinical Correlate

Celiac artery stenosis can cause post‑prandial abdominal pain and weight loss, while aneurysms may present with rupture risk. Celiac plexus block is employed for refractory upper abdominal pain, particularly in pancreatic malignancy. Accurate identification of the trunk and its branches guides both diagnostic imaging and therapeutic interventions.