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The Dorsal Vagal Complex Forms a Sensory-Motor Lattice: The Circuitry of Gastrointestinal Reflexes
Published in Sue Ritter, Robert C. Ritter, Charles D. Barnes, Neuroanatomy and Physiology of Abdominal Vagal Afferents, 2020
T.L. Powley, H.-R. Berthoud, E.A. Fox, W. Laughton
Specifically, three sets of observations suggest the basis of the lattice organization of the vagal trigone: (1) Viewed from a perspective dorsal to the medulla, the pattern of projections of alimentary canal primary afferents in the NST is a series of terminal fields forming transversely disposed bands or patches corresponding to different nerves and nerve branches and thus to different receptor surfaces. (2) The pools of abdominal preganglionic neurons in the dmnX consist of longitudinally running columns of cells corresponding to different branches of the abdominal vagus. (3) The dmnX cells and the overlying portion of the NST are welded together. That is, they are effectively fused because (a) the sensory and motor nuclei have a common horizontal boundary; (b) the two nuclei evidence some intermingling of their neurons; (c) the NST has substantial second—or higher—order projections into the dmnX; (d) some dendrites of the motor neurons reach dorsally into the sensory nucleus, and (e) some dendrites of NST neurons may reach into the neuropil of the dmnX.
Microsurgical techniques for achieving gross total resection of ependymomas of the fourth ventricle
Published in Acta Chirurgica Belgica, 2020
There exists some discrepancy in the literature regarding the the most appropriate terminology and designation of specific anatomic structures and regions within the floor of the fourth ventricular cavity. Specifically, Rhoton [48,52] designates the zone lying between the “hypoglossal triangle” and the “area acoustica” to be the soi-disant “vagal triangle,” though Di Ieva and colleagues [52] and the majority of authors utilize the term ala cinerea. Moreover, Di Ieva and colleagues describe the vagal trigone to be the region lying immediately lateral to the sulcus limitans and medial to the area acoustica, with an impression in its inferior aspect termed the fovea inferior. We deem it most appropriate or proper the alternate use of either vagal trigone and ala cinerea as preferable to “vagal triangle” to designate the ventricular zone located inferolateral to the hypoglossal trigone, medial to the area acoustica, and superomedial to the area postrema.