Distribution and dynamics of methyl methacrylate (MMA) in contact with polystyrene-block-poly(methacrylic acid) micelles under the conditions of its full solubility in D2O (2 g/L) were studied by H-1 NMR methods, in particular pulsed-gradient-stimulated echo (PGSE), transverse relaxation, and rotating-frame relaxation, under varying intensity of the spin-lock field. It was found that MMA can penetrate into the micellar core after many hours at 300 K. In a freshly prepared system, MMA resides almost exclusively in the micellar shell. Its radial distribution there can be described by a Gaussian function with a maximum at the core - shell interface and a mean scatter of about 1.66 x R, where R is the radius of the core. Although it is fairly stable during the rotational and translational diffusion of the micelle as a whole, this distribution has an internal dynamics. According to the combined results of NMR, individual MMA molecules exchange their residence sites with an average correlation time of about 5 x 10(-4) s. Transient sorption of MMA molecules to methacrylic acid units is discussed as a probable explanation of this dynamics.