1. Method of segmenting a three-dimensional structure from a three-dimensional data record, containing in particular medical data values, comprising the steps of: a) providing a three-dimensional, deformable model whose surface area is formed by a network of meshes, which connect together points of the network on the surface area of the model, the meshes being divided into groups and each group being allocated a structure function, b) arranging the model at the position in the three-dimensional data record in which the structure to be segmented is located, c) determining one candidate point for each mesh with the aid of the structure function of the group to which the mesh concerned belongs, d) recalculating the points of the network of the model on the basis of the candidate points found, e) repeating steps c) and d), taking the newly calculated points of the network into account, as long as no termination criterion is met.