Chapter 5 development of orofacial structures
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Primary Palate Formation: forms from?
what does it separate? gives rise to?
- Intermaxillary Segment
- nasal and oral cavities
- anterior incisors
Secondary Palate Formation:
bilateral palatal shelves form from?
what direction do they grow at first?
then what do they do?
once they fuse what do they form?
- Maxillary processes
- snap upward
- secondary palate
what does the tongue do so it doesnt get in the way of the "snap"?
from where to where?
- from the pharynx to the oral cavity
Secondary Palate Formation
gives rise to
- maxillar canines
- posterior maxillary teeth
- soft palate
when the palate is complete what is fused?
if there is failure of fusion what is it called?
the primary and secondary palate
Cleft Uvula and Cleft Palate
- Fig A Pg 46 mildest form
- palatal shelves didnt fuse completely in the back
- (milk up the nose)
Bilateral Cleft of the Secondary Palate
Fig B Pg 46 Palatal shelves didnt fuse to each other at all
Cleft of the Pramary Palate
Fig C&D Pg 46 Primary palate didnt fuse with secondary palate
Cleft of both Promary and Secondary Palate
Fig E Pg 46 nobody felt like fusing
II. Nasal Cavity and Septum Development
Septum develops from the ----- then fuses with the -----.
what does it divide?
what is "deviated"
- intermaxillary segment palate
- nasal cavity
- cause snoring and other sinus problems
III. Tongue Development
where does it happen?
then where does it move to?
Bodyof tongue formation starts with:
A. tuberculum impar where at?
behind branchial arch I
Body of tongue starts with tuberculum impar (A) then two lateral lingual swellings (b)
Two lateral lingual swellings B. develop on each side of the tuberculum impar.
body of tongue starts with tuberculum impar (A) then two lateral lingual swellings (b) what do these form?
these fuse and overgrow the tuberculum impar to form the body of the tongue.
body of tongue
midline lingual frenum what do the cells do?
what is it called when this is too long and restricts movement?
midline lingual frenum
Base of the tongue formation: branchial arch 2 & 4
C. Copula what is i,t where does it come from and what does it form?
- is a swelling from branchial arch 2
- forms the base of the tongue
Base of the tongue Formation
D. Epiglottic swelling were does it come from and what does it form?
- comes from branchial arch 4
- will become the epiglottis that covers the trachea when you swallow
Completion of Tongue Formation
Copula fuses with?
- Tongue body
- sulcus terminalis (where body and base meet)
Completion of Tongue Formation
The ------ points backward to a depression called the -----.
- sulcus terminalis
- foramen cecum
Completion of Tongue formation
the foramen cecum is the beginning of the?
- thyroglossal duct
- (thyroid develops here and migrates to neck)
completion of tongue formation
the tongue is innervated by ---- of nerves because the tissue came fromso many different branchial arches.
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