AIIMS Bhuvneshwar NO…: Islets of Langerhans are rich in which part of pancreas?

AIIMS Bhuvneshwar NO- 2018

Applied Anatomy

Easy

Appeared in: AIIMS Bhuvneshwar NO- 2018

Explanation

The pancreas is a gland with both exocrine (digestive) and endocrine (hormonal) functions.
The endocrine functions are performed by cell clusters called the Islets of Langerhans.
Anatomical studies confirm that the tail of the pancreas contains the highest density and most significant number of these Islets of Langerhans.

Option A: The body of the pancreas contains a mixed population of exocrine and endocrine cells, but the concentration of Islets of Langerhans is lower than in the tail.
Option B: The head of the pancreas is predominantly composed of exocrine acinar tissue, which produces digestive enzymes. It has a lower concentration of islets compared to the tail.
Option D: The neck is a small, constricted part that connects the head and body of the pancreas. It is not the region with the highest concentration of islets.

Visual 1: Diagram - A comparative microscopic view showing a higher density of Islets of Langerhans (lightly stained clusters) in the pancreatic tail versus a higher density of exocrine acini (darker stained tissue) in the pancreatic head.
Visual 2: Anatomical Chart - An illustration of the pancreas showing its blood supply, highlighting the splenic artery's proximity to the body and tail, which is relevant for surgical considerations.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomical distribution of endocrine cells in the pancreas as background academic context rather than a clinical decision trigger.
During a splenectomy (spleen removal), the surgeon must be extremely careful to avoid damaging the adjacent tail of the pancreas. Injury to the tail can lead to the loss of a large number of insulin-producing cells, potentially causing iatrogenic (surgically-induced) diabetes.
Insulinomas, which are tumors of the beta cells of the islets, are often found in the body or tail of the pancreas, consistent with the higher density of islet cells in these regions.
What if a patient needs a distal pancreatectomy (removal of the body and tail)? The patient would be at a very high risk for developing diabetes and would require close monitoring of blood glucose levels and likely insulin therapy post-operatively.

How to Approach the Question

First, identify the key terms in the question: 'Islets of Langerhans' and 'rich in which part of pancreas'.
Recall that Islets of Langerhans are the endocrine (hormone-producing) component of the pancreas.
Remember that the pancreas has a non-uniform structure. The different parts (head, body, tail) have different proportions of endocrine and exocrine tissue.
Recall the specific distribution pattern: the endocrine cells (islets) are most concentrated in the tail, while the exocrine cells (for digestion) are more concentrated in the head.
Based on this knowledge, select 'Tail' as the part richest in Islets of Langerhans.

Concept Tested & Keywords

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E6 Anatomy Grays 43e Vol 1 Part 3 p. 458-460