Growth of silica particles in microemulsion systems consisting of cetyltrimethylammonium bromide (CTAB), sodium salicylate (NaSal), tetraethyl orthosilicate (TEOS), and water has been investigated. The diagram of composition is given to show the region wherein a transient networklike structure is formed from CTAB micellar aggregates with cylindrical geometry. As TEOS becomes concentrated, the content of CTAB necessary for the network formation steeply increases. The growth of silica particles is studied by means of static and dynamic light scattering, and the effect of the micellar network structure is discussed. The SLS measurements give smaller values of the structural correlation length when the silica particles are formed in the network medium than in a dispersed structure. The structural relaxation behavior obtained from the DLS measurements shows a slowly decaying mode for the networklike medium, suggesting the retardation effect by the networklike structure of CTAB molecules. The networklike structure effectively prevents the interminable growth of the silica particles by blocking their free motions.