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. 2020 Jan 2;30(6):3483–3517. doi: 10.1093/cercor/bhz322

Figure 4.

Figure 4

Extent of intra-areal horizontal connections in the tangential domain of areas V1, V2, and V5. Horizontal connections in V1 are most prominent in L2/3 and 5 but exist also in L4B/upper 4Cα and 6 (Amir et al. 1993; Angelucci et al. 2002b). In V2, horizontally spreading connections emerge from L2 and L3 and some from L5 and L6 (Levitt et al. 1994b). In V5, locally projecting neurons are predominantly found in L2 and L3 and, following deep layer injections, also in L6 (Ahmed et al. 2012). In the center of each cortical slab is a halo (black dot) of dense, unspecific local connectivity, surrounded by more specific patches of terminal clusters (gray dots). In V1, the OD pattern (modified from LeVay et al. 1975) and, in V2, the schematics of the CO bands are approximately at scale. In V5, the darker shading in layers 4–6 depicts heavier myelination. The horizontal connection extents are average maxima across studies from M. fascicularis and M. mulatta: V1, (Amir et al. 1993; Angelucci et al. 2002b); V2 (Amir et al. 1993); and V5 (Ahmed et al. 2012).