# Hemilineage **Collection:** [[collections/Neurotech|Neurotech]] **Type:** Developmental neurobiology concept **Primary source:** [[articles/2026 Annual Report on Brain-Computer Interfaces|2026 Annual Report on Brain-Computer Interfaces]] ## Definition A **hemilineage** is a developmental grouping of neurons descending from one branch of a neural progenitor lineage after an asymmetric division pattern. ## Relationships - The [[wiki/Cambridge Drosophila Connectomics Group|Cambridge Drosophila Connectomics Group]] used hemilineages as developmental units in FlyWire annotation. - Hemilineage, [[wiki/Neuronal Class|neuronal class]], and [[wiki/Cell Type|cell type]] are related but non-interchangeable classification levels.