Number of reterogradely labeled neurons in different brain areas following injection of CTb into the ventrolateral periaquaductal gray area (vlPAG).

The CTb labeled cells were counted bilaterally in the eight mice, the site and the spread of CTb in these mice is shown in figure 14 (A-H). As shown in fig. 14, mice # 17–20 were injected unilaterally on the right side and the table shows the counts of the labeled cells on ipsilateral and contralateral side of the CTb injection. Mice # 11, 12, 13 and 21 were injected bilaterally in vlPAG. Abbreviations: contra = contralateral to injection site; ipsi = ipsilateral to injection site; L = left; R = right.