Fig. 10.

Distribution of retrogradely labeled cells following injections into areas 4γFL and 4γHL. A) Photograph of cortical surface showing sites in which injections of Texas Red (TR, red squares) and Alexa Fluor 488 (AF488, green triangles) were made. B) Averaged EMG responses to intracortical microstimulation at the 2 sites indicated. C–E) Three sagittal sections through the pericruciate cortex at different lateralities indicating the location of retrogradely labeled cells in the dorsal and ventral banks of the cruciate sulcus and in surrounding areas. Red symbols indicate Texas Red labeled cells from the injections in the forelimb representation and green symbols indicate cells labeled by the Alexa Fluor injections in the hindlimb representation. F, G) Distribution of cells labeled from the injections into the forelimb (F) and hindlimb (G) representations of the motor cortex. Color of symbols indicates the percentage of cells in each 200 μm bin (see key in Fig. 9A). H) The areas with the largest percentage of labeled cells (≥80% per bin) are displayed. For this part of the figure, red indicates cells labeled from the forelimb representation and green indicates cells labeled from the hindlimb representation. St, semitendinosus; Srt, anterior head of sartorius; TA, tibialis anterior; TriL, lateral head of triceps brachii.