In this article we will delve into the fascinating world of Dorsal longitudinal fasciculus, exploring its most relevant and profound aspects. Along these lines we will analyze its impact in different contexts, from the personal to the social sphere, including its influence in the professional and cultural sphere. Dorsal longitudinal fasciculus is a topic that has aroused great interest today, and through this research we will try to shed light on its multiple facets and its relevance in contemporary society. We hope that this reading is enriching and provokes deep reflection on Dorsal longitudinal fasciculus and its meaning in our lives.
This article relies largely or entirely on a single source. (January 2008) |
Dorsal longitudinal fasciculus | |
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Details | |
Identifiers | |
Latin | fasciculus longitudinalis posterior, fasciculus longitudinalis dorsalis |
NeuroNames | 599 |
NeuroLex ID | birnlex_986 |
TA98 | A14.1.05.305 |
TA2 | 5868 |
FMA | 83845 |
Anatomical terms of neuroanatomy |
The dorsal longitudinal fasciculus (DLF) (not to be confused with the medial longitudinal fasciculus, nor the superior longitudinal fasciculus) is a longitudinal tract interconnecting the posterior hypothalamus, and the inferior medulla oblongata. It contains both ascending tracts and descending tracts, and serves to link the forebrain, and the visceral autonomic centres of the lower brainstem. It conveys both visceral motor signals, and sensory signals.
The DLF is a periventricular longitudinal white matter fiber tract located within the periaqueductal gray matter of the dorsal tegmentum of the brainstem. The tract consists of a diffuse pathway comprising ascending visceral sensory axons and descending hypothalamic axons; it conveys both visceral motor signals and sensory signals.
The ascending tract of the DLF originates in the nuclei of the reticular formation; its fibers synapse in the hypothalamus. It conveys visceral information to the brain.
Brainstem afferents in DLF include fibers coming from the parabrachial area, which conveys taste and general visceral sensation to the hypothalamus from the nucleus of the tractus solitarius in the medulla. Afferents distribute to the posterior nucleus and periventricular nuclei of the hypothalamus.
The descending portion of the DLF originates in the hypothalamus. These fibers then descend through the brain stem periaqueductal gray matter along the base of the fourth ventricle. These fibers continue on into the spinal cord where they synapse with preganglionic autonomic neurons.
Hypothalamic efferents in DLF arise from the paraventricular nucleus, supraoptic nucleus and periventricular nucleus, and send information to multiple areas, including:
Note that at least some of the output from the hypothalamus lies outside of the DLF, within a set of Descending Hypothalamic Fibers running next to the spinothalamic tract; lesions of this area canonically lead to ipsilateral Horner's syndrome.
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