9. Development of the face (workbook) Flashcards
what does the face develop from?
5 building blocks
what are the 5 building blocks from which the face develops from?
- frontonasal prominence (process)
- 2 x maxillary prominences (swellings)
- 2 x mandibular prominences (swellings)
what is the first evidence of the face development?
the appearance of a DEPRESSION in the ectoderm on the ventral aspect of the head
what is the ectoderm (outermost) on the ventral (front) aspect of the head known as?
stomadaeum
what is the stomadaeum?
site of future mouth
how is the face created?
the 5 prominences fold around the stomadaeum (future mouth) to create the face
what will the frontonasal prominence form?
the forehead,
bridge of nose,
upper eyelids,
centre of the upper lip
what will the laterally paired MAXILLARY prominences form?
the middle 1/3rd of the face,
upper jaw,
most of the lip,
sides of the nose
what will the paired MANDIBULAR prominences form?
lower 1/3rd of the face,
lower jaw,
lip
which prominences are the 1st pharyngeal arch?
maxillary and mandibular prominences
what are each paired prominences (maxillary and mandibular) made of? (1st pharyngeal arch)
mesenchyme
a covering of ectoderm and endoderm
what will happen to the (M+M) prominences eventually?
fuse together to complete the face + facial clefts
what does cleft lip result from?
defect of fusion of the maxillary and mandibular prominences to form the face + facial clefts
