The lateral zone received input largely from the radial wrist, forearm, and upper arm, but sites were also encountered that were responsive to input from the shoulder. This standardized map was then used to plot receptive Etoposide solubility dmso fields in forelimb-intact controls. Our interpretation of the organization of CN is summarized in Fig. 3B. From a total of 631 penetrations, 330 penetrations were recovered that passed through clusters of labeling in CN approximately 300 μm rostral to the obex, and receptive fields were measured at 2490 locations from
these penetrations. Receptive fields of CN neurons in forelimb amputees were examined systematically during the first 5 weeks post-amputation (n=20) and between 6 and 8 weeks (n=6) and 9 through 12 weeks (n=6); one additional rat was mapped at 26 weeks and another rat mapped at 30 weeks post-amputation. The experiments described below were selected to illustrate those maps that in our estimation best represented the averaged body part representation within the barrelette-containing
central zone following selected periods of forelimb amputation. Sites that included this website the suture or stump were noted on the matrix maps, but were not included in the areal measurements. Within the first post-deafferentation week, few sites within the CN were responsive to new input. An example from a 1-WD map is illustrated in Fig. 4. In this rat, 6 electrode penetrations were used to map CN and their entry points into the brainstem, in relationship to the obex, are shown in Fig. 4A. The inset shows the CO-rich clusters found within the central zone. Reconstruction of the recording sites (black circles) is illustrated in the coronal section in Fig. 4B; receptive fields were examined at 100-μm steps along the penetration and continued to a depth of 800 μm. Note that in penetration nos. 1 and 6, the path of the electrode was clearly demarcated from blood coagulation as the electrode passed through the brainstem. The receptive field recordings made at each step along a penetration are shown in matrix format in Fig.
4C. Inspection of the matrix revealed that the majority of sites within the former forelimb representation Cepharanthine were unresponsive to peripheral input with the exception that neurons at a depth of 300 μm in the medial zone responded to input from the skin immediately around the suture (SU). Two additional 1-WD rats had similar unresponsive sites throughout all 3 zones in CN. However, these findings were in contrast to those from the fourth 1-WD rat, for which a row of electrode penetrations passed through the lateral border of the central zone where receptive fields were encountered for the shoulder and neck. In 3-WD rats (n=5), new input was observed in all three zones. An example from one 3-WD rat is shown in Fig. 5.