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Multiple neuroanatomical tract-tracing: Approaches for multiple tract-tracing

Neuroanatomical Tract-Tracing 3: Molecules, Neurons, and Systems, Page: 336-365
2006
  • 19
    Citations
  • 0
    Usage
  • 32
    Captures
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    Mentions
  • 0
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    19
    • Citation Indexes
      19
  • Captures
    32

Book Chapter Description

Experimental neuroanatomical tracing techniques are fundamental to the study of the structure of the central nervous system. In the last few decades, many new methods for axonal tracing and cell labeling have been introduced. Neuroanatomical tracing applied as an isolated method produces relatively straightforward answers, for instance, whether there is connectivity from compartment Y in nucleus A to layer X in area B. However, questions that deal with the intrinsic complexity of brain circuits require the application of multiple-tracing paradigms in which two or even three different tracers are combined in single histological sections. With such paradigms we can handle questions like are the fibers arriving in layer X of area B in contact with neurons that project to compartment Z in nucleus C, do these projection neurons receive as well innervation from area W, and what is the neurochemical signature of these connectivity-identified neurons?We illustrate this approach with examples from our studies on pallidonigral connectivity in association with nigrostriatal efferent neurons. Analysis of the data acquired via a multiple-tracing approach provides more insight into the organization of the brain than does the analysis of data from single tracing, especially when it comes to network circuitry. Furthermore, by virtue of the simultaneous visualization of projections in the same section, these multiple techniques enable the precise determination of the degree of convergence or divergence of particular projections to a particular terminal zone or to particular neurons (the latter to be identified via retrograde tracing or via neurotransmitter immunocytochemistry). An additional advantage of multitracer methods is that the experimental animals can be most efficiently used and the number of used animals reduced. In this chapter we will discuss in detail several existing protocols for the simultaneous detection of three different tracers, as well as methods in which we combine two tracers and the immunocytochemical detection of a neuroactive substance. Emphasis will be placed on providing a step-by-step account of each procedure. We will be dealing with peroxidase substrates and precipitates with different colors since these precipitates are persistent without specific storage measures and because at the end of the staining procedure the ensuing slides can be studied any time under any routine microscope.

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