We extract J and Ks magnitudes from the 2MASS Point Source Catalog for approximately 6* 106 stars with 8 <= Ks <= 13 in order to build an \itAK extinction map within 10o of the Galactic centre. The extinction was determined by fitting the upper giant branch of (Ks, J-Ks) colour-magnitude diagrams to a dereddened upper giant branch mean locus built from previously studied Bulge fields. The extinction values vary from \itAK=0.05 in the edges of the map up to \itAK=3.2 close to the Galactic centre. The 2MASS extinction map was compared to that recently derived from DENIS data. Both maps agree very well up to \itAK=1.0. Above this limit, the comparison is affected by increased internal errors in both extinction determination methods. The 2MASS extinction values were also compared to those obtained from dust emission in the far infrared using DIRBE/IRAS. Several systematic effects likely to bias this comparison were addressed, including the presence of dust on the background of the bulk of 2MASS stars used in the extinction determination. For the region with 3o<|b|<5o, where the dust contribution on the far side of the Galaxy is 5 %, the two extinction determinations correlate well, but the dust emission \itAK values are systematically higher than those from 2MASS. A calibration correction factor of 76% for the DIRBE/IRAS dust emission extinction is needed to eliminate this systematic effect. Similar comparisons were also carried out for the 1o<|b|<3o and |b| < 0.5o strips, revealing an increasing complexity in the relation between the two extinction values. Discrepancies are explained in terms of the calibration factor, increasing background dust contribution, temperature effects influencing the dust emission extinction and limitations in the 2MASS extinction determination in very high extinction regions (|b| < 0.5o). An asymmetry relative to the Galactic plane is observed in the dust maps, roughly in the sense that \itAK values are 60% smaller in the south than in the north for 1o<|b|<5o. This asymmetry is due to the presence of foreground dust clouds mostly in the northern region of the Bulge.