Dental Embryology Chapter 4 |151 questions| with correct answers

At the beginning of what week does the primitive mouth become the stomodeum? A. week 3 B. Week 4 C. Week 5 D. week 6 CORRECT ANSWER c. Week 4 How do most facial structures develop? CORRECT ANSWER fusion During week 4, the frontonasal process forms and gives rise to 5 structures: CORRECT ANSWER nasal placodes, nasal pits, medial and lateral nasal processes, intermaxiallary segment. During week 4, where does the maxillary process form? CORRECT ANSWER From the mandibular arch on each side of the stomodeum In week 4, What event enlarges the primitive mouth and allows access to the primitive pharynx? CORRECT ANSWER Disintegration of the oropharyngeal membrane The maxillary process fuses with the medial nasal process to form what structure during week 4? CORRECT ANSWER upper lip The maxillary process fuses with each mandibular arch to form what structures in the 4th week? CORRECT ANSWER labial commissures Origin of stomodeum CORRECT ANSWER ectodermal depression that is enlarged by the disintegration of the oropharyngeal arch.