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The present study indicates a rather extensive network of neurotensin neurons in the central nervous system of the dog.
This would indicate that GABAergic neurons do not only occur in the central but also in the peripheral nervous system.
Thus, many neurons in the central nervous system (CNS) of a wide variety of higher organisms project so‐called commissural axons across the midline.
The neurons with axons projecting both into the cord and rostrally into the midbrain presumably coordinate activity at higher and lower levels of the nervous system.
This study demonstrates that a specific surface antigen is found on a subset of neurons and suggests that other surface markers may be present on other subsets of mammalian central nervous system neurons.
Thus, neurons isolated from one region of the nervous system can stimulate the proliferation of non-neuronal cells isolated from other neural regions.
Nigrostriatal neurons, a population of pallidal cholinergic neurons, and a subclass (or classes) of neostriatal neurons, including cholinergic interneurons, thus can be classified as central nervous system (CNS) neurons with a relatively strong regenerative response.
This could have important implications in understanding the role of neurotrophins in the development of the vertebrate nervous system.
This study indicates that the subset of neurons in the autonomic nervous system likely to be capable of responding to neurotrophins is broader than generally thought, and that p75-expressing neurons tend to be clustered.
The Pleurobranchaea nervous system may provide the means for studying individual neurons within such analyses of global activity.
These cells may facilitate characterization of neurons in the human central nervous system.
It is likely that a substantial fraction of the local circuit neurons present in other regions of the central nervous system are also invisible as populations to current techniques.
This might be also the case for the central nervous system, namely cnidarians are suggested to have primitive central nervous system.
In this chapter, we provide evidence that these neurons can be widely detected in the chick nervous system.
Our results show that individual neurons of the central nervous system can coexpress neurotrophins and their receptors and produce two neurotrophic factors.

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