All are TRUE about thyroid gland, EXCEPT:
The thyroid develops from the floor of the primitive pharynx during the third week of gestation. Rare ectopic location of thyroid tissue is at the base of the tongue (lingual thyroid) The hormone synthesis normally begins at about 11 weeks' gestation. Ref: Harrison, E-18, P-2911
Development stas at 3rd week of gestation
It develops from the floor of the primitive pharynx
Ectopic location of the thyroid gland is at the base of the tongue
Thyroid hormone synthesis begins at 20th week of gestation