EMBRYOLOGY

Question 1

1. What are the four sequences apposition of enamel and dentin? (Formative, 2015)

Answer 1

 Morphogenetic Stage

 Histodifferentiation

 Secretory Stage

 Maturation Stage

Question 2

2. Cleft lip & palate / Ventricular Septal Defect (Formative, 2005)
   a. Describe, with diagrams, the development of the palate in utero

Answer 2

• Primary palate: intermaxillary segment formed by 2 medial nasal processes and gave rise to anterior palate
• Secondary palate: maxillary segments give rise to 2 palatal shelves, which grow vertically downwards initially. Tongue moves downwards and forwards and the palatal shelves then move into a horizontal position and fused together finally, the primary palate and the secondary palate fuse together