Embryological study of the development of thin membranous dense connective tissues around the esophagus using two fetal cadavers

During the mid-to-late fetal development period, regional differentiation of collagen fiber density in the mediastinum becomes apparent, forming the structural basis for the vascular and visceral sheaths in adults. Vascular pulsations and esophageal peristaltic movements are presumed to be the driving forces behind this process.