Fig. 3From: Structure, function and cell dynamics during chaetogenesis of abdominal uncini in Sabellaria alveolata (Sabellariidae, Annelida) a 3D model of the chaetal arrangement inside an abdominal torus. b–e Aligned semi-thin sections used to construct the 3D model. Corresponding section planes are marked in A. The arrow indicates the direction of chaetal formation. fs formative site, uc uncini, cc capillary chaetaeBack to article page