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Cholinergic projections to the anterior thalamic nuclei in the rat: a combined retrograde tracing and choline acetyl transferase immunohistochemical study. 1995

A Gonzalo-Ruiz, and M J Sanz-Anquela, and A R Lieberman
Department of Anatomy, School of Physiotherapy, Soria, Spain.

Retrograde transport of horseradish peroxidase (HRP) was combined with choline acetyltransferase (ChAT) immunohistochemistry to study cholinergic projections to the anterior thalamic nuclei in the rat. Small iontophoretic injections of HRP placed into different subdivisions of the anterior thalamic nuclear complex resulted in distinct patterns of retrograde labelling in two major cholinergic cell groups of the mesopontine tegmentum, the laterodorsal tegmental nucleus (LDTg), in which a majority of the labelled cells was located, and the pedunculopontine tegmental nucleus (PPT). After injections into the posterior subdivision of the anteroventral thalamic nucleus (AVp), double-labelled neurons were present predominantly in the ipsilateral LDTg while a smaller number was found in the PPT. In the ipsilateral LDTg, 60-70% of ChAT-positive neurons were HRP-labelled, and 90-95% of the HRP-labelled neurons were ChAT-positive. In the contralateral LDTg, 30-40% of ChAT-positive neurons were HRP-labelled. After injections in the medial subdivision of the anteroventral thalamic nucleus (AVm), the pattern of labelling in LDTg was similar to that detected after injections in the AVp. The number of double-labelled neurons in the LDTg and PPT was much lower after injections into AVm than after injections into AVp. When injections were confined to the anterodorsal thalamic nucleus (AD), no HRP-labelled cells were present in the LDTg or PPT. These results show that the LDTg and PPT are the sources of the cholinergic input to the rat anterior thalamus. The major projection from LDTg and PPT is to the AVp, whereas there is a lighter cholinergic projection to the AVm. The AD does not receive a projection from cholinergic cells in the mesopontine tegmentum.

UI MeSH Term Description Entries
D007150 Immunohistochemistry Histochemical localization of immunoreactive substances using labeled antibodies as reagents. Immunocytochemistry,Immunogold Techniques,Immunogold-Silver Techniques,Immunohistocytochemistry,Immunolabeling Techniques,Immunogold Technics,Immunogold-Silver Technics,Immunolabeling Technics,Immunogold Silver Technics,Immunogold Silver Techniques,Immunogold Technic,Immunogold Technique,Immunogold-Silver Technic,Immunogold-Silver Technique,Immunolabeling Technic,Immunolabeling Technique,Technic, Immunogold,Technic, Immunogold-Silver,Technic, Immunolabeling,Technics, Immunogold,Technics, Immunogold-Silver,Technics, Immunolabeling,Technique, Immunogold,Technique, Immunogold-Silver,Technique, Immunolabeling,Techniques, Immunogold,Techniques, Immunogold-Silver,Techniques, Immunolabeling
D008297 Male Males
D009474 Neurons The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM. Nerve Cells,Cell, Nerve,Cells, Nerve,Nerve Cell,Neuron
D010275 Parasympathetic Nervous System The craniosacral division of the autonomic nervous system. The cell bodies of the parasympathetic preganglionic fibers are in brain stem nuclei and in the sacral spinal cord. They synapse in cranial autonomic ganglia or in terminal ganglia near target organs. The parasympathetic nervous system generally acts to conserve resources and restore homeostasis, often with effects reciprocal to the sympathetic nervous system. Nervous System, Parasympathetic,Nervous Systems, Parasympathetic,Parasympathetic Nervous Systems,System, Parasympathetic Nervous,Systems, Parasympathetic Nervous
D002795 Choline O-Acetyltransferase An enzyme that catalyzes the formation of acetylcholine from acetyl-CoA and choline. EC 2.3.1.6. Choline Acetylase,Choline Acetyltransferase,Acetylase, Choline,Acetyltransferase, Choline,Choline O Acetyltransferase,O-Acetyltransferase, Choline
D006735 Horseradish Peroxidase An enzyme isolated from horseradish which is able to act as an antigen. It is frequently used as a histochemical tracer for light and electron microscopy. Its antigenicity has permitted its use as a combined antigen and marker in experimental immunology. Alpha-Peroxidase,Ferrihorseradish Peroxidase,Horseradish Peroxidase II,Horseradish Peroxidase III,Alpha Peroxidase,II, Horseradish Peroxidase,III, Horseradish Peroxidase,Peroxidase II, Horseradish,Peroxidase III, Horseradish,Peroxidase, Ferrihorseradish,Peroxidase, Horseradish
D000110 Acetylcholinesterase An enzyme that catalyzes the hydrolysis of ACETYLCHOLINE to CHOLINE and acetate. In the CNS, this enzyme plays a role in the function of peripheral neuromuscular junctions. EC 3.1.1.7. Acetylcholine Hydrolase,Acetylthiocholinesterase,Hydrolase, Acetylcholine
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013681 Tegmentum Mesencephali Portion of midbrain situated under the dorsal TECTUM MESENCEPHALI. The two ventrolateral cylindrical masses or peduncles are large nerve fiber bundles providing a tract of passage between the FOREBRAIN with the HINDBRAIN. Ventral MIDBRAIN also contains three colorful structures: the GRAY MATTER (PERIAQUEDUCTAL GRAY), the black substance (SUBSTANTIA NIGRA), and the RED NUCLEUS. Accessory Oculomotor Nuclei,Annular Nucleus,Darkshevich's Nucleus,Interstitial Nucleus of Cajal,Mesencephalic Tegmentum,Mesencephalic Trigeminal Nucleus,Midbrain Tegmentum,Midbrain Trigeminal Nucleus,Nucleus Annularis,Nucleus Nervi Trochlearis,Nucleus Sagulum,Nucleus Tractus Mesencephalici Nervi Trigemini,Nucleus of Darkschewitsch,Peripeduncular Nucleus,Sagulum Nucleus,Tegmentum of Midbrain,Trochlear Nucleus,Ventral Tegmental Nucleus,Annulari, Nucleus,Annularis, Nucleus,Cajal Interstitial Nucleus,Darkschewitsch Nucleus,Darkshevich Nucleus,Darkshevichs Nucleus,Mesencephali, Tegmentum,Mesencephalic Tegmentums,Mesencephalus, Tegmentum,Midbrain Tegmentums,Nervi Trochleari, Nucleus,Nervi Trochlearis, Nucleus,Nuclei, Accessory Oculomotor,Nucleus Annulari,Nucleus Nervi Trochleari,Nucleus Sagulums,Nucleus, Annular,Nucleus, Darkshevich's,Nucleus, Mesencephalic Trigeminal,Nucleus, Midbrain Trigeminal,Nucleus, Peripeduncular,Nucleus, Sagulum,Nucleus, Trochlear,Nucleus, Ventral Tegmental,Oculomotor Nuclei, Accessory,Sagulum, Nucleus,Sagulums, Nucleus,Tegmental Nucleus, Ventral,Tegmentum Mesencephalus,Tegmentum, Mesencephalic,Tegmentum, Midbrain,Tegmentums, Mesencephalic,Tegmentums, Midbrain,Trigeminal Nucleus, Mesencephalic,Trigeminal Nucleus, Midbrain,Trochleari, Nucleus Nervi,Trochlearis, Nucleus Nervi
D013787 Thalamic Nuclei Several groups of nuclei in the thalamus that serve as the major relay centers for sensory impulses in the brain. Nuclei, Thalamic

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