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Embryo-Face Dev
Embryology development of face NWHSU
| Question | Answer |
|---|---|
| The mouth arises from ______. | Surface Ectoderm |
| Another name for the primitive mouth is ______. | Stomodeum |
| This structure separates the stomodeum from the pharynx. | Buccopharyngeal (oropharyngeal) membrane |
| When does the buccopharyngeal membrane rupture? | 24 days |
| When does the facial primordia appear? | 4th week |
| What forms the facial primordia? | Proliferation of underlying mesoderm |
| The frontal prominence forms what structures? | Forehead, dorsum, and apex of nose |
| The two maxillary processes form what structures? | Cheeks, lateral parts of upper lip and jaw, and secondary palate |
| What facial primordia forms the lower face, jaw and lip? | Mandibular process of the 1st branchial arch |
| Nasal placodes appear in the 4th week from _____. | surface ectoderm |
| The alae of the nose arise from ____. | lateral nasal swellings |
| The medial nasal swellings form what structures? | Philtrum of upper lip, middle part of maxilla (four incisors), and entire primary palate |
| What are the nasal pits? | Depressed area between medial and lateral nasal swellings |
| This later forms the nasolacrimal duct. | Nasolacrimal groove |
| From where do the muscles of facial expression arise? | Mesenchyme of 2nd arch |
| The triangle in front of palatine foramen is the _____. | Primary palate |
| What separates the primary and secondary palate? | Incisive foramen |
| Describe formation of secondary palate. | In 6th week palatine shelves grow obliquely downward on each side of tongue. In 7th week, palatine shelves ascend to horizontal positions above tongue and fuse. They also fuse with nasal septum. |
| In the lateral cleft lip, where is the cleft located? | Edge of the philtrum |
| In the cleft upper jaw, where is the cleft located? | Between the incisors and cuspids |
| What is the embryonic cause of a median cleft lip? | failure to fuse medial nasal swellings |
| What is the embryonic cause of a oblique facial cleft? | failure to fuse lateral nasal and maxillary swellings |
| What is macrostomia? | Under fused - larger mouth |
| What two anomalies form in failure of palatine shelves to fuse together? | Cleft of secondary palate and cleft of uvula |
| This is Trish's |
Created by:
sdschwartz
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