Islets Review

In T1D, the immune system mistakenly identifies beta cells as foreign invaders (like a virus). An autoimmune attack destroys the beta cells, leaving the islets without insulin producers. Without insulin, patients cannot process glucose. This is why T1D patients require external insulin injections or pumps. Interestingly, in T1D, the alpha cells remain intact—meaning patients still produce glucagon, which can lead to dangerous hypoglycemia if they take too much insulin.

This article explores the anatomy, function, and medical significance of the Islets, illuminating why these microscopic structures are monumental in their importance. Islets

Despite their small size (each islet is only 50–500 micrometers in diameter—roughly the width of a few human hairs), they are incredibly vascularized. Each islet is wrapped in a dense network of capillaries, allowing the hormones they secrete to diffuse directly into the bloodstream within seconds. In T1D, the immune system mistakenly identifies beta

To understand the Islets, we must first look at their history. In 1869, a German medical student named Paul Langerhans was studying the structure of the pancreas under a microscope. He noticed clusters of cells that were lighter in color than the surrounding tissue. He famously described them as "little islands of cells in a sea of acinar tissue." This is why T1D patients require external insulin

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