endodermal bud derived from the endodermal epithelium of the embryonic pharyngeal floor[MP]. The thyroid diverticulum is the embryological structure from which thyroid follicular cells derive. It grows from the floor of the pharnyx[WP]. [ http://en.wikipedia.org/wiki/Thyroid_diverticulum MP:0004662 ]

This is just here as a test because I lose it