Embryology of Teeth Tongue Thyroid Dr Shivaram Bhat
![Embryology of Teeth, Tongue, Thyroid Dr Shivaram Bhat Embryology of Teeth, Tongue, Thyroid Dr Shivaram Bhat](https://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-1.jpg)
Embryology of Teeth, Tongue, Thyroid Dr Shivaram Bhat
![Learning objectives • Embryology of teeth from dental lamina • Development of tongue from Learning objectives • Embryology of teeth from dental lamina • Development of tongue from](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-2.jpg)
Learning objectives • Embryology of teeth from dental lamina • Development of tongue from floor of pharyngeal pouches • Development of thyroid from thyroid diverticulum • Applied embryology related to above organs
![Questions • Embryology & anomalies thyroid • Embryology & Anomalies of tongue • Embryology Questions • Embryology & anomalies thyroid • Embryology & Anomalies of tongue • Embryology](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-3.jpg)
Questions • Embryology & anomalies thyroid • Embryology & Anomalies of tongue • Embryology & nerve supply of tongue • Development of teeth • • Anomalies of tongue Thyroglossal duct Thyroglossal cyst Anomalies of thyroid
![Time line of events • • 4 weeks – lingual swellings and tuberculum impar Time line of events • • 4 weeks – lingual swellings and tuberculum impar](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-4.jpg)
Time line of events • • 4 weeks – lingual swellings and tuberculum impar 5 weeks – hypopharyngeal eminence, thyroid 6 weeks – dental lamina 7 weeks – thyroid in definitive position 8 – 10 weeks – enamel organs 6 months – enamel, dentine, tongue 9 months – cementum Birth – periodontal ligaments
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-5.jpg)
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-6.jpg)
![TEETH TEETH](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-7.jpg)
TEETH
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-8.jpg)
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-9.jpg)
![Dental lamina Dental lamina](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-10.jpg)
Dental lamina
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-11.jpg)
![Stages Stages](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-12.jpg)
Stages
![Stages Stages](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-13.jpg)
Stages
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-14.jpg)
![Deciduous teeth Deciduous teeth](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-15.jpg)
Deciduous teeth
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-16.jpg)
![Dental buds for permanent teeth Dental buds for permanent teeth](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-17.jpg)
Dental buds for permanent teeth
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-18.jpg)
![Permanent teeth Permanent teeth](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-19.jpg)
Permanent teeth
![Embryological origin • Ectoderm – Ameloblasts – Enamel • Mesoderm ( neural crest ) Embryological origin • Ectoderm – Ameloblasts – Enamel • Mesoderm ( neural crest )](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-20.jpg)
Embryological origin • Ectoderm – Ameloblasts – Enamel • Mesoderm ( neural crest ) – Odontoblasts – Dentine • Mesenchyme – Cementoblasts – Cementum, Periodontal ligament
![Morphology Morphology](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-21.jpg)
Morphology
![Applied aspects • • Anodentia Gemination Natal teeth Amelogenesis imperfecta Dentinogenesis imperfecta Tooth impaction Applied aspects • • Anodentia Gemination Natal teeth Amelogenesis imperfecta Dentinogenesis imperfecta Tooth impaction](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-22.jpg)
Applied aspects • • Anodentia Gemination Natal teeth Amelogenesis imperfecta Dentinogenesis imperfecta Tooth impaction Dentigerous cyst
![TONGUE TONGUE](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-23.jpg)
TONGUE
![Floor of primitive pharynx Floor of primitive pharynx](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-24.jpg)
Floor of primitive pharynx
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-25.jpg)
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-26.jpg)
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-27.jpg)
![Nerve supply Nerve supply](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-28.jpg)
Nerve supply
![Nerve supply Nerve supply](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-29.jpg)
Nerve supply
![To summarise • Anterior 2/3 rd - 2 lateral lingual swellings and 1 median To summarise • Anterior 2/3 rd - 2 lateral lingual swellings and 1 median](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-30.jpg)
To summarise • Anterior 2/3 rd - 2 lateral lingual swellings and 1 median lingual swelling • Posterior 1/3 rd - hypobranchial eminence • Posterior most part – 4 th pharyngeal arch • Muscles of tongue – occipital myotomes
![Anomalies of tongue • • Aglossia. Microglossia Macroglossia Ankyloglossia Cleft tongue Bifid tongue Lingual Anomalies of tongue • • Aglossia. Microglossia Macroglossia Ankyloglossia Cleft tongue Bifid tongue Lingual](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-31.jpg)
Anomalies of tongue • • Aglossia. Microglossia Macroglossia Ankyloglossia Cleft tongue Bifid tongue Lingual thyroid
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-32.jpg)
![THYROID GLAND THYROID GLAND](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-33.jpg)
THYROID GLAND
![Thyroid development Thyroid development](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-34.jpg)
Thyroid development
![Floor of primitive pharynx Floor of primitive pharynx](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-35.jpg)
Floor of primitive pharynx
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-36.jpg)
![Caudal pharyngeal complex Caudal pharyngeal complex](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-37.jpg)
Caudal pharyngeal complex
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-38.jpg)
![To summarise Thyroid develops from • Thyroid diverticulum from foramen cecum at the junction To summarise Thyroid develops from • Thyroid diverticulum from foramen cecum at the junction](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-39.jpg)
To summarise Thyroid develops from • Thyroid diverticulum from foramen cecum at the junction of tuberculum impar and copula • Caudal pharyngeal complex from 4 th arch and also probably disappearing 5 th arch. • Starts functioning by 3 -4 months
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-40.jpg)
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-41.jpg)
![• Absence of isthmus, + 1 lobe • Presence of pyramidal lobe • • Absence of isthmus, + 1 lobe • Presence of pyramidal lobe •](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-42.jpg)
• Absence of isthmus, + 1 lobe • Presence of pyramidal lobe • Levator glandulae thyroidae
![THYROID GLAND- Pyramidal lobe THYROID GLAND- Pyramidal lobe](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-43.jpg)
THYROID GLAND- Pyramidal lobe
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-44.jpg)
![](http://slidetodoc.com/presentation_image_h/0ed4e74254c5d4eea411c8f82ae9b89d/image-45.jpg)
- Slides: 45