Abstract:
:The cellular origin and degree of collateralization of the subcortical afferents to the caudate nucleus and the putamen in squirrel monkeys (Saimiri sciureus) were studied using the following combinations of fluorescent retrograde tracers: Evans blue and DAPI-Primuline, Fast blue and Nuclear yellow, True blue and Nuclear yellow. After the injections, cells containing the tracer delivered in caudate nucleus (caudate-labeled cells) and others labeled with the complementary tracer injected in putamen (putamen-labeled cells) occur in large number in intralaminar nuclei, substantia nigra pars compacta, midbrain raphe nuclei and central midbrain tegmentum. In addition, a small to moderate number of putamen-labeled cells is found in external pallidum, pulvinar and laterodorsal thalamic nuclei, and basolateral amygdaloid nucleus, whereas some caudate and putamen-labeled cells are scattered in ventral tegmental area and locus coeruleus. However, ver few double-labeled cells are present in all these structures. In rostral intralaminar nuclei, the labeled cells are not confined to the know cytoarchitectonic boundaries of the nuclei but impinge slightly upon ventrolateral and mediodorsal nuclei. At this level, the caudate-labeled cells lie more dorsally and medially relative to putamen-labeled cells, but a high degree of intermingling exists and some double-labeled cells occur particularly in nucleus centralis lateralis. In caudal intralaminar nuclei, caudate-labeled cells are strictly confined to parafascicular nucleus and putamen-labeled cells present only in centre median, without any overlap between the two neuronal populations. In substantia nigra pars compacta, clusters of caudate-labeled cells are closely intermingled with clusters of putamen-labeled cells according to a complex mosaic-like pattern that varies along the rostrocaudal extent of the structure. Overall, however, caudate-labeled cells predominate rostrodorsally and putamen-labeled cells are more abundant caudoventrally in substantia nigra pars compacta, with only a few double-labeled cells. Some caudate and putamen-labeled cells are also scattered in contralateral substantia nigra pars compacta. In dorsal raphe nucleus, putamen labeled cells tend to occupy a more lateral position relative to caudate-labeled cells, with again very few double-labeled neurons. The caudate and putamen-labeled cells are less numerous and more closely intermingled in nucleus centralis superior. Numerous striatal afferent cells are also found bilaterally in the peribrachial region of midbrain tegmentum, comprising the pedunculopontine nucleus area.(ABSTRACT TRUNCATED AT 400 WORDS)
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Parent A,Mackey A,De Bellefeuille Ldoi
10.1016/0306-4522(83)90104-5subject
Has Abstractpub_date
1983-12-01 00:00:00pages
1137-50issue
4eissn
0306-4522issn
1873-7544pii
0306-4522(83)90104-5journal_volume
10pub_type
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