Transverse section of definitive thyroid of embryo number 4430. The zone of contact between median and lateral components, free of connective tissue, has become broader. Tissues of the parathyroid, lateral thyroid, and median thyroid are shown from the top of the figure downward.  

 

Weller, G. L. 1933. Development of the thyroid, parathyroid and thymus glands in man. Contributions to Embryology Vol. 24, 93-139.

 
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