Morse-Smale complex. a: Descending manifolds of maxima and saddles. b: Ascending manifolds of minima and saddles. c: The Morse-Smale complex is obtained as an overlay of these ascending and descending manifolds. d: Paths connecting saddles within each cell of the MS complex segment the surface into peaks and valleys.
Staadt et al. BMC Cell Biology 2007 8(Suppl 1):S10 doi:10.1186/1471-2121-8-S1-S10