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. 2017 Apr 21;102(5):489–521. doi: 10.1113/EP085776

Figure 16. Thalamocortical innervation patterns of L5tt cell dendrites by VPM and POm axons.

Figure 16

A, schematic drawing of the layers of a PW column and thalamic inputs from VPM (red) and POm (green) to L5B. B, examples of dendrite geometry of two subtypes of L5tt cells, defined by cluster analysis of dendrite geometry. The difference between the major fraction (blue, left) and a smaller fraction (violet, right) of L5tt cells is the greater length of the oblique apical dendrites in the L4 domain of the cell type shown on the right. C and D, overlay of L5tt dendrite density (blue and violet lines) and calculated thalamic bouton density profiles (red and green lines) for the two subtypes of L5tt cells, suggesting that L5tt pyramids are differentially innervated by VPM and POm axons. Only POm boutons are likely to innervate apical tuft dendrites. D shows that the L5tt subtype with oblique dendrites in the L4 domain (violet curve) is likely to be innervated dually by VPM projections at its basal and apical oblique dendrites. From Meyer et al. 2010 b, with permission.