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Afferents of the mouse linear nucleus
Huazheng Liang1,2, George Paxinos3
1Department of Neurology, Translational Research Institute of Brain and Brain-like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, 1878 North Sichuan Road, Hongkou District, Shanghai, 200081, China. andyliang2018@126.com.
Molecular Brain
|May 7, 2020
Summary
The linear nucleus (Li) receives input from brain regions controlling motor and cardiovascular functions. This study maps these connections, revealing Li
Area of Science:
- Neuroscience
- Neuroanatomy
Background:
- The linear nucleus (Li) was identified in 1978, primarily noted for its cerebellar projections.
- Systematic studies of Li's broader central nervous system connections are lacking, potentially due to technical challenges with retrograde tracers.
Purpose of the Study:
- To investigate the afferent connections of the linear nucleus (Li) from key motor and cardiovascular control centers.
- To elucidate the role of Li beyond its known cerebellar pathways.
Main Methods:
- Anterograde tracer injections (BDA) were utilized to trace projections into the linear nucleus (Li).
- Injections targeted specific nuclei including the central amygdaloid nucleus, paralemniscal nucleus, noradrenergic group 7/Köllike-Fuse nucleus/subcoeruleus nucleus, gigantocellular reticular nucleus, and solitary nucleus/parvicellular/intermediate reticular nucleus.
Main Results:
- Labeled fibers were observed in the ipsilateral Li following injections into the central amygdaloid nucleus.
- Bilateral projections to Li, with ipsilateral dominance, were found after injections into the paralemniscal, noradrenergic group 7/Köllike-Fuse/subcoeruleus, gigantocellular reticular, and solitary/parvicellular/intermediate reticular nuclei.
- Retrogradely labeled neurons were identified in Li from all tested nuclei except the central amygdaloid and paralemniscal nuclei.
Conclusions:
- The linear nucleus (Li) receives significant input from diverse brainstem nuclei involved in motor and cardiovascular regulation.
- These findings suggest Li's involvement in a wider range of physiological functions than previously understood, extending beyond motor and balance control.
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