Estimated number of labeled boutons of the contralateral corticospinal projection to the anatomical subsectors of lamina IX in injection site case SDM77-BDA (M1/LPMCd transition area) and injection site case SDM72-FD (LPMCv post-arcuate area). Each bar is the estimated number of boutons in each specified lamina VII subsector for an individual case as indicated on the abscissa. Note the prominent distribution of terminal LPMCd/M1 labeling in the dorsomedial and dorsolateral quadrants in case SDM77-BDA. In contrast, no labeling was found in lamina IX in case SDM72-FD. Subsector abbreviations: DM, dorsomedial; DL, dorsolateral; VM, ventromedial; VL, ventrolateral.