Pyramidal cell types and circuit organization of the mouse insular cortex reveal functional specializations.

Twenty-one morphological, twelve electrical, and nine input neuronal types are identified among 1,130 mouse insular pyramidal neurons, revealing cellular diversity and specialization.

• Why it matters: Understanding the cellular and circuit substrates of the insular cortex is crucial because it mediates bodily homeostasis, emotion, and learning, yet remains less characterized than primary cortices.
• What they did: The study quantified dendritic morphology, projections, electrical properties, and local inputs of insular pyramidal neurons, mapping them onto a model and defining distinct neuronal types with advanced algorithms.
• The result: Morphological types predict inputs and projection targets, with eight types differentially distributed between anterior and posterior insula, and some receiving long-range excitatory inputs linking sensory information to valence behaviors.