In A the medial aspect of the right half of the thyroid gland of embryo number 4430 is shown. Demarcation between median and lateral portions are less distinct, and remnants of the connection with the pharynx have almost disappeared. B and C show typical transverse sections in which relative positions and outlines of lateral and median thyroid components are compared.  

 

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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