Views of the Stage 18 thymus. A, The thymus is greatly elongated and directed toward the midline. B, Medial aspect showing the bifurcated upper portion, which contains anteriorly the parathymus gland and posteriorly thymus tissue and remnant of the connection with the pharynx. C, ramifications of cavities are shown.  

 

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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