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Embryo-Face Dev

Embryology development of face NWHSU

QuestionAnswer
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: Shawn D. Schwartz Shawn D. Schwartz on 2011-07-14



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