Abstract
In this chapter, we compare the pattern of pulvinar immunohistochemical staining for the calcium-binding proteins calbindin and parvalbumin and for the neurofilament protein SMI-32 in macaque, capuchin, and squirrel monkeys. This group of New and Old World primates shares five similar pulvinar subdivisions: PIP, PIM, PIC, PIL, and PILS. In the Old World macaque monkey, the inferior-lateral pulvinar can be subdivided into the P1 and P2 fields based on its connectivity with visual area V1. On the other hand, only the P1 field and no P2 was found in the New World capuchin monkey. Notably, the similarities in chemoarchitecture contrast with the distinct connectivity patterns and the different visuotopic organizations found across the species.
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Immunohistochemical studies have revealed five similar pulvinar subdivisions (PIP, PIM, PIC, PIL, and PILS) in the macaque, capuchin, and squirrel monkeys (Table 1.1 and Fig. 3.3), which include the entire PI but which also encompass parts of the PL and PM (Cusick et al. 1993; Gutierrez et al. 1995; Gray et al. 1999; Adams et al. 2000; Soares et al. 2001). The similarities in chemoarchitecture contrast with the distinct connectivity patterns and the different visuotopic organizations found across species. In the capuchin monkey, Soares et al. (2001) were unable to clearly segregate P1 from P2 based on pulvinar connectivity with V1, V2, MT, and V4, as it is the case in the macaque monkey (Ungerleider et al. 1983). This contrasts with the fact that capuchin and macaque monkeys share a very similar chemoarchitecture. Areas V2 and V4 in the capuchin monkey have preferential connections with the P1 field, which may correspond to the ventrolateral complex of the pulvinar described by Gattass et al. (1978a) and would correspond to both P1 and P2 of the macaque monkey, as described by Ungerleider et al. (1983). A similar partitioning was described by Cusick et al. (1993) and Stepniewska and Kaas (1997), who also established that the subdivisions of PI that receive ascending projections from the SC are distinct from the PI subdivision that projects to area MT. Inasmuch as the PI (P1, P2, and P3) is the only tecto-recipient region of the pulvinar (Partlow et al. 1977), the function of its connections with V4 may include modulating tectal input to this cortical area.
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Gattass, R., Soares, J.G.M., Lima, B. (2018). Comparative Pulvinar Organization Across Different Primate Species. In: The Pulvinar Thalamic Nucleus of Non-Human Primates: Architectonic and Functional Subdivisions. Advances in Anatomy, Embryology and Cell Biology, vol 225. Springer, Cham. https://doi.org/10.1007/978-3-319-70046-5_8
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DOI: https://doi.org/10.1007/978-3-319-70046-5_8
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