Summary
The area postrema is part of the floor of the 4th ventricle. The vessels in the area postrema are large and organised in a close network. Along the path of these vessels, numerous bulges or capillary loops are found beneath the ventricular ependyma. Their structure is similar to that of other circumventricular organs.
The arteries reach the area postrema on its external side, the veins on the other hand leave from the internal side. Both the veins and the arteries are dependent on the larger vessels of the dorsal side of the medulla.
No consistent anastomoses of importance connect the vascular network of the area postrema to the vessels of the choroidal plexus or to the vessels of the underlying nervous tissue.
Résumé
L'area postrema appartient au plancher du 4ème ventricule. Les vaisseaux qui l'occupent sont volumineux et forment un réseau serré; ils présentent sur leur trajet de nombreuses dilatations ou anses capillaires situées sous l'épendyme ventriculaire. Leur architecture est semblable à celle des autres organes circumventriculaires.
Les artères atteignent l'area postrema par son bord externe, les veines au contraire s'en dégagent par son bord interne; les uns et les autres sont tributaires des troncs vasculaires de la face dorsale du bulbe.
Le réseau vasculaire de l'area postrema ne présente aucune anastomose importante ou constante avec les vaisseaux des plexus choroïdes ou du tissu nerveux sous-jacent.
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Duvernoy, H., Koritké, J.G., Monnier, G. et al. Sur la vascularisation de l'area postrema et de la face posterieure du bulbe chez l'homme. Z. Anat. Entwickl. Gesch. 138, 41–66 (1972). https://doi.org/10.1007/BF00519924
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DOI: https://doi.org/10.1007/BF00519924