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The classification of pancreatic neuroendocrine structures (4).
| Autonomic ganglion | No endocrine cells |
| Neuro-insular complex type I | Few endocrine cells in ganglion |
| Few ganglionic cells in islet | |
| Neuro-insular complex type II | Single or a few endocrine cells associated with a bundle of nerve fibers |
| Heavily innervated islet tissue | |
| Classical islet of Langerhans | Innervated |
| Not innervated |
