Page "Thymus" Paragraph 12
from
Wikipedia
Here they meet and become joined to one another by connective tissue, but there is never any fusion of the thymus tissue proper.
The pharyngeal opening of each diverticulum is soon obliterated, but the neck of the flask persists for some time as a cellular cord.
By further proliferation of the cells lining the flask, buds of cells are formed, which become surrounded and isolated by the invading mesoderm.
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