1. Thyroid gland development embryology
BILAL HUSSEIN
GSM medical education

2. Embryology in words

5. Pharyngeal arches

7. Initial embryology Thyroid 1st endocrine gland Day 23 of gestation
Proliferation of endodermal cells on medline pharyngeal floor
Between 2 keys structures tuberculum impar and copula Called foramen cecum

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10. It is developed from endodermal cells of floor of pharynx
It begins as diverticulum at dorsum of the tongue between tuberculum impar and hypobranchial eminences
Elongation of thyroid diverticulum to form thyroglossal duct. It elongate downwards infront of hyoid bone and thyroid cartilage here it ends dividing into two parts.
Ultimobranchial body gives parafollicular cells to thyroid gland.
At the 3rd month thyroid start to produce colloid and some thyroxin.

12. Fate of thyroglossal duct
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Fate of thyroglossal duct
Upper end of the duct remains as foramen cecum on dorsum of the tongue.
The duct degenerate from foramen cecum and hyoid bone
The duct from hyoid bone to divisions of the duct form levator glandulae thyroideae and may be pyramidal lobe
Divisions of the duct form lobes of thyroid gland with isthmus in between.
Thyroid tissue derived from endoderm. And parafollicular cells of the thyroid are derived from neural crest.
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15. Thyroglossal duct cyst
Presents as an anterior midline neck mass that moves with swallowing or protrusion of the tongue.

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