Figure 3.

Example of a superposition of the bouton density map on the microstimulation derived muscle map obtained in the same animal. The size of each dot is proportional to the number of boutons in a grid element of 83 × 83 mm, quantitative details may be found in Capaday et al. (2009). Evoked muscle responses at each point at which microstimulation was applied are represented by the color code of the legend (left). Gray circles represent points at which no response was obtained (NR). Note that at many cortical points more than one muscle was recruited. (A) The microstimulation derived muscle map at 1.0× threshold. (B) The muscle map obtained at 1.5× threshold. Muscle abbreviations: EDC, extensor digitorium communis; ECR, extensor carpi radialis; PL, palmarus longus; FDP, flexor digitorium profundus; ClBr, clavo brachialis; Br, brachialis; SpD, spino deltoid; LD, latissimus dorsi. Reproduced from Capaday et al. (2009).