Ectopic thyroid

Japanese: 異所性甲状腺 - いしょせいこうじょうせん
Ectopic thyroid


[Cause, type]
The causes include the following: (1) Absence of the thyroid gland due to abnormalities in the development of the thyroid gland during fetal development (athyroid cretinism), incomplete thyroid formation (hypoplasia), or abnormal location (ectopic thyroid gland). During fetal development, the thyroid gland primordium originates from an epithelial depression on the ventral midline of the pharynx, and is located at the base of the tongue, but gradually descends to its normal position in the neck.

*Some of the terminology that refers to "ectopic thyroid" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:


[原因,種類]
 原因としては以下のものがある。(1)胎児期の甲状腺発生過程の異常による甲状腺欠損(無甲状腺性クレチン病)や不完全な甲状腺形成(形成不全),あるいは位置の異常(異所性甲状腺という。胎児期の甲状腺原基は咽頭の腹側正中線上の上皮陥没に由来し,その位置は舌のつけ根にあるが,徐々に下降して頸部の正常の位置に移動する。…

※「異所性甲状腺」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

<<:  Ectopic hormone syndrome

>>:  Ectopic ACTH syndrome

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