Table 1.
Summary of the distribution of labeled axon fibers ipsilateral to the cell body
| Cerebral cortex | Striatum | Diencephalon | Midbrain | Pons | Medulla oblongata | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Neuron number | LA index | Projection type | Thalamus | ||||||||||||||||||||
| Cg | AGm | AGl | FL | S1BF | CPu | AV | POm | STN | ZI | Hb | APT | RN | SC | PAG/mRt | PN | PnO/PnC | Gi | IO | IRt | MV | |||
| 148 | 0.2409 | IT | − | ++ | ++* | ++ | ++ | +++ | − | − | − | − | − | − | − | − | − | − | − | − | − | − | − |
| 089 | 0.3870 | IT | ++* | ++ | ++ | − | − | − | − | − | − | − | − | − | − | − | − | − | − | − | − | − | − |
| 168 | 0.4070 | PT | − | ++* | − | − | − | + | − | + | + | ++ | − | + | − | + | ++ | +++ | − | − | − | − | − |
| 129 | 0.4665 | IT | − | ++* | ++ | − | ++ | − | − | − | − | − | − | − | − | − | − | − | − | − | − | − | − |
| 118 | 0.4825 | IT | + | ++* | ++ | − | − | ++ | − | − | − | − | − | − | − | − | − | − | − | − | − | − | − |
| 119 | 0.5147 | IT | ++* | − | − | − | − | +++ | − | − | − | − | − | − | − | − | − | − | − | − | − | − | − |
| 179 | 0.5149 | PT | − | +++ | +++* | + | − | + | − | ++ | + | +++ | − | + | − | ++ | ++ | +++ | ++ | ++ | − | +++ | ++ |
| 203 | 0.5987 | PT | + | ++* | − | − | − | ++ | − | ++ | + | ++ | − | + | − | ++ | +++ | ++ | − | + | + | − | − |
| 091 | 0.6875 | PT | − | ++* | + | − | − | ++ | − | − | + | ++ | − | + | + | + | +++ | ++ | +++ | ++ | + | ++ | ++ |
| 098 | 0.7434 | PT | ++ | ++* | − | + | − | ++ | + | − | + | ++ | + | − | − | + | +++ | ++ | ++ | + | − | − | − |
Axon density was semi-quantitatively evaluated and classified according to the following standards: +++, two or more axonal clusters; ++, one cluster; +, no cluster but axon fibers present; −, no axon fibers. * indicates the location of the cell body. The vM1 was confirmed by intracortical microstimulation. The vM1 area straddled the Cg, as well as the medial and lateral agranular cortices (AG). AGl, lateral agranular cortex; AGm, medial agranular cortex; APT, anterior pretectal nucleus; AV, anteroventral thalamic nucleus; CPu, caudate putamen; FL, forelimb area; Gi, gigantocellular reticular nucleus; Hb, habenular nucleus; IO, inferior olive; IRt, intermediate reticular nucleus; LA index; large-amplitude index; MV, medial vestibular nucleus; mRt, mesencephalic reticular formation; PAG, periaqueductal gray; PN, pontine nuclei; PnC, caudal part of pontine reticular nucleus; PnO, oral part of pontine reticular nucleus; POm, posterior thalamic nuclei; RN, red nucleus; SC, superior colliculus; STN, subthalamic nucleus; S1BF, barrel field of primary somatosensory cortex; ZI, zona incerta.