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Development of the tongue and thyroid (First pharyngeal arch…
Development of the tongue and thyroid
First pharyngeal arch
proliferation of mesoderm in floor of pharynx
Median tongue bud (tuberculum impar)
Distal tongue buds (lateral lingual swellings)
rapidly over grow tuberculum impair
anterior 2/3 of tongue
Third Branchial arch
mesoderm
hypobranchial/hypopharyngeal eminence
Second pharyngeal arch
mesoderm
copula
hypobranchial eminence covers copula
posterior 1/3 of tongue
whole tongue
dorsal endoderm of tongue
Thyroid diverticulum
descends ventral/anterior to hyoid and larynx
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Thyroglossal duct is formed opening into foramen caecum
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4th arch
contributes to
forms root of tongue and epiglottis