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Development of Palate and Tongue PPT
The document discusses the prenatal development of the palate and tongue, starting from the fourth week of gestation with the formation of the olfactory placodes and the subsequent development of the upper lip by the sixth week. It details the formation of the primary and secondary palate through the fusion of different processes and the elevation of palatal shelves, as well as the anatomical and developmental aspects of the tongue. Key structures involved in tongue formation include the first pharyngeal arch and hypobranchial eminences, leading to the differentiation of the anterior and posterior parts of the tongue.
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Development of Palate and Tongue PPT
- 1. DEVELOPMENT OF PALATE AND TONGUE DR AMITHAG, BDS, MDS ORAL AND MAXILLOFACIAL PATHOLOGY
- 2. • Central facebegins to develop by 4th week, when olfactory placodes appear on both sides of the frontonasal process. • Gradually both placodes develop to form the median and lateral nasal process. • Upper lip is formed by 6th week by fusion of two median nasal processes in midline and the maxilllary process of the 1st branchial arch.
- 3. PRE-NATAL GROWTH ANDDEVELOPMENT OF PALATE • Formation of primary and secondary palate • Elevation of palatal shelves • Fusion of palatal shelves
- 4. STRUCTURE OF PALATE Primarypalate Secondary palate
- 5. PALATE FORMATION From eachmaxillary process 2 plate- like shelf grow medially called palatal process. 3 components contribute to the palate formation • 2 palatal process • primitive palate from the frontonasal process
- 6. Definitive palate isformed by fusion of these 3 parts.
- 7. PRIMARY PALATE Frontonasal processMedial nasal Mesenchyme Wedge shaped mass between internal surface of maxillary prominencePrimary palatePre-maxilla
- 8.
- 9. Secondary palate Maxillary prominence 2horizontal mesenchymal projections With each other Primary palate Secondary palate Lateral palatine process Fuse- Nasal septum
- 10. ELEVATION OF PALATALSHELVES At 6 weeks •Tongue (undifferentiated tissue) pushes dorsally •Palatal shelves become vertical •Elevation occurs from vertical to horizontal position
- 11. ELEVATION OF PALATE HISTOLOGICALSECTION Nasal septum Palatal shelves tongue
- 12. • At 8weeks Elevation of palatal shelves Muscular movement Pressure differences Biomechanical transformation Intrinsic shelf force Differential mitotic growth Withdrawal of embryo’s face
- 13. FUSION OF PALATALSHELVES Entire palate does not fuse at the same time Initially contact occur In the central region of 2ndary palate post. to premaxilla. Extended anteriorly and posteriorly
- 14.
- 15. TONGUE • Largest singlemuscular organ inside the oral cavity. • Originates from the muscle of occipital myotomes. • Innervates by 5th ,7th ,9th &10th cranial nerves.
- 16. PARTS OF THETONGUE • The first pharyngeal arch forms the anterior(movable) body of the tongue • The second & third arches form the posterior (immovable) • Body & base.
- 17. • Tissues ofthe tongue has 3 parts: • Two lateral lingual swellings • The central tuberculum impar. • A large midline swelling arises from medial ends of 2nd ,3rd & 4th arches called hypobranchial eminences.
- 18. The eminence soonsubdivide into: • Cranial part (2nd & 3rd arch) • Caudal part (4th arch)
- 19. • The anteroiortwo-third of the tongue is formed by fusion of the two lingual swellings the tuberculum impar • The posterior one-third of the tongue is formed from cranial part of hypobrachial eminence. • The posterior-most part from the caudal part
- 20.