Thyroid gland development embryology

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Thyroid gland development embryology BILAL HUSSEIN GSM medical education www.greatassmiplemedicine.com

Embryology in words www.greatassmiplemedicine.com

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Pharyngeal arches www.greatassmiplemedicine.com

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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 www.greatassmiplemedicine.com

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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. www.greatassmiplemedicine.com

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Fate of thyroglossal duct all rights are reserved 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. www.greatassmiplemedicine.com all rights are reserved

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Thyroglossal duct cyst Presents as an anterior midline neck mass that moves with swallowing or protrusion of the tongue. www.greatassmiplemedicine.com

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