Which artery supplies blood to the large intestine?

RRB Nsg. Superintendent - 29 April 2025 (Shift-3rd)

Applied Anatomy

Easy

Appeared in: RRB Nsg. Superintendent - 29 April 2025 (Shift-3rd)

Explanation

The correct option is the Mesenteric artery, which is a general term for the two main arteries supplying the large intestine.
The Superior Mesenteric Artery (SMA) supplies the cecum, appendix, ascending colon, and the first two-thirds of the transverse colon (derivatives of the midgut).
The Inferior Mesenteric Artery (IMA) supplies the last one-third of the transverse colon, descending colon, sigmoid colon, and upper rectum (derivatives of the hindgut).

Option A: The phrenic arteries (superior and inferior) are responsible for supplying blood to the diaphragm, the muscle that separates the thoracic and abdominal cavities.
Option C: The celiac artery, or celiac trunk, is the artery of the foregut. It supplies organs like the stomach, liver, spleen, and the proximal part of the duodenum.
Option D: This option is too specific and incomplete. The superior rectal artery is the terminal branch of the inferior mesenteric artery. While it supplies the rectum (part of the large intestine), the term 'Mesenteric artery' is a much broader and more accurate answer for the entire large intestine.

Visual 1: Diagram - An illustration of the abdominal aorta showing its main branches: the celiac trunk, superior mesenteric artery (SMA), and inferior mesenteric artery (IMA). Arrows should indicate which parts of the gastrointestinal tract each artery supplies, clearly distinguishing the areas fed by the SMA and IMA along the large intestine.

Clinical Relevance

Nursing practice connection: Knowing Arterial supply to the large intestine helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Understanding the gut's blood supply is crucial for recognizing conditions like mesenteric ischemia, where blood flow to the intestines is compromised.
Symptoms of acute mesenteric ischemia include sudden, severe abdominal pain that is often described as 'pain out of proportion to physical exam findings'. This is a surgical emergency requiring prompt diagnosis and intervention to prevent bowel necrosis.
What if? - If a patient with atherosclerosis develops a thrombus that occludes the origin of the Inferior Mesenteric Artery (IMA), the blood supply to the descending and sigmoid colon would be compromised. However, due to the presence of the Marginal Artery of Drummond (an anastomosis between the SMA and IMA), the colon might remain viable, and the patient could be asymptomatic or have milder symptoms.

How to Approach the Question

First, identify the key anatomical structure in the question: the 'large intestine'.
Next, recall the three main unpaired arteries that branch from the abdominal aorta to supply the digestive tract: the celiac trunk (foregut), the superior mesenteric artery (midgut), and the inferior mesenteric artery (hindgut).
Associate the parts of the large intestine with their embryological origin. The ascending colon and most of the transverse colon are from the midgut, while the rest of the large intestine is from the hindgut.
Conclude that the blood supply must come from the superior and inferior mesenteric arteries.
Evaluate the given options. 'Mesenteric artery' is a collective term for the SMA and IMA, making it the most appropriate answer.
Eliminate the other options: Phrenic artery (diaphragm), Celiac artery (foregut organs like the stomach), and Rectal artery (too specific).

Concept Tested & Keywords

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