期刊
JOURNAL OF COMPARATIVE NEUROLOGY
卷 525, 期 6, 页码 1403-1420出版社
WILEY
DOI: 10.1002/cne.23998
关键词
pulvinar; dorsal lateral geniculate nucleus; corticoclaustral; GABA; synapse; retinogeniculate; corticothalamic; RRID:AB_94259; RRID:AB_258833; RRID:AB_477652; RRID:AB_2278725; RRID:AB_572256; RRID:AB_477329; RRID:AB_2333091; RRID:nif-000-30467
资金
- National Institutes of Health [R01EY016155, R21EY021016]
The tree shrew (Tupaia belangeri) striate cortex is reciprocally connected with the dorsal lateral geniculate nucleus (dLGN), the ventral pulvinar nucleus (Pv), and the claustrum. In the Pv or the dLGN, striate cortex projections are thought to either strongly drive, or more subtly modulate activity patterns respectively. To provide clues to the function of the claustrum, we compare the synaptic arrangements of striate cortex projections to the dLGN, Pv, and claustrum, using anterograde tracing and electron microscopy. Tissue was additionally stained with antibodies against gamma-aminobutyric acid (GABA) to identify GABAergic interneurons and non-GABAergic projection cells. The striate cortex terminals were largest in the Pv (0.94 +/- 0.08 mu m(2)), intermediate in the claustrum (0.34 +/- 0.02 mu m(2)), and smallest in the dLGN (0.24 +/- 0.01 mu m(2)). Contacts on interneurons were most common in the Pv (39%), intermediate in the claustrum (15%), and least common in the dLGN (12%). In the claustrum, non-GABAergic terminals (0.34 +/- 0.01 mu m(2)) and striate cortex terminals were not significantly different in size. The largest terminals in the claustrum were GABAergic (0.51 +/- 0.02 mu m(2)), and these terminals contacted dendrites and somata that were significantly larger (1.90 +/- 0.30 mu m(2)) than those contacted by cortex or non-GABAergic terminals (0.28 +/- 0.02 mu m(2) and 0.25 +/- 0.02 mu m(2), respectively). Our results indicate that the synaptic organization of the claustrum does not correspond to a driver/modulator framework. Instead, the circuitry of the claustrum suggests an integration of convergent cortical inputs, gated by GABAergic circuits. (C) 2016 Wiley Periodicals, Inc.
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