Prenatal and Postnatal Development and also Morphological and Morphometric Indicators of Thymus in Newborns

The thymus is a lymphoepithelial organ located in the mediastinum and reaches its maximum development in youth. While other lymphoid organs develop exclusively from the mesenchyme (mesoderm), the thymus is of dual embryonic origin. Its lymphocytes develop in the bone marrow from cells of mesenchymal origin; they invade the epithelial bud, which has developed from the endoderm of the third and fourth pharyngeal pockets. The thymus is covered with a connective tissue capsule, which is introduced into the parenchyma and divides it into incomplete lobules, so the cortex and medulla of the adjacent lobules are connected to each other.

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