Hepatic artery is the branch of -

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2024

Explanation

The hepatic artery originates from the coeliac artery (also known as the coeliac trunk).
The coeliac trunk is the first major unpaired branch of the abdominal aorta, responsible for supplying blood to the organs of the embryonic foregut.
It typically trifurcates (divides into three) into the Left Gastric Artery, the Splenic Artery, and the Common Hepatic Artery.
The Common Hepatic Artery is the branch that leads to the hepatic artery proper, which directly supplies the liver.

Option A: The Gastric artery (specifically the left gastric artery) is a sister branch to the hepatic artery, not its parent vessel. Both arise from the coeliac trunk.
Option B: The Splenic artery is also a sister branch to the hepatic artery, originating from the coeliac trunk. It is the largest of the three branches.
Option D: The Phrenic artery primarily supplies the diaphragm. It is not part of the coeliac trunk system and usually arises directly from the aorta.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Arterial supply of the upper abdomen as background academic context rather than a clinical decision trigger.
Knowledge of coeliac trunk anatomy is critical for surgeons during procedures like liver resection, cholecystectomy (gallbladder removal), or pancreatic surgery to avoid accidental vessel injury and ensure adequate blood supply.
The gastroduodenal artery, a branch of the common hepatic artery, runs behind the duodenum. A posterior duodenal ulcer can erode this artery, leading to life-threatening hemorrhage.
What if? A common anatomical variation is a 'replaced' right hepatic artery arising from the superior mesenteric artery instead of the coeliac trunk. If a surgeon is performing a Whipple procedure (pancreaticoduodenectomy) and is unaware of this variation, they could accidentally cut the liver's main blood supply.

How to Approach the Question

First, identify the core anatomical question being asked: 'What is the origin of the hepatic artery?'.
Recall the major unpaired arteries that branch from the abdominal aorta to supply the gastrointestinal tract: the coeliac trunk, superior mesenteric artery, and inferior mesenteric artery.
Mentally place the liver (supplied by the hepatic artery) in the upper abdomen, a region corresponding to the embryonic foregut.
Associate the foregut with its primary blood supply, which is the coeliac trunk (or coeliac artery).
Confirm this by recalling the three main branches of the coeliac trunk: left gastric, splenic, and hepatic. This confirms the direct relationship and helps eliminate the other options, which are either sister branches (gastric, splenic) or unrelated (phrenic).

Concept Tested & Keywords

QN7GRtvi82Fr8dFQz283oc

E6 Anatomy BDChaurasia V2 10e Part 2 p. 53-55

E6 Anatomy Applied Ashalatha 4e p. 180-182

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