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9 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Describe the stages of palatal development.
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Development of Palate:
5th-6th wk: PRIMARY PALATE (intermaxillary segment fused from MEDIAL NASAL PROCESSES) 6th-12th wk: SECONDARY PALATE (fused PALATAL SHELVES from max. processes) 12th wk: FINAL PALATE: fusion of ALL THREE PROCESSES |
DEHA Ch 5, p 52; Table 5.1
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What is the difference between the primary and secondary palate? To what does each give rise?
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PRIMARY PALATE Form:
(1) Anterior 1/3 hard palate (2) max incisors SECONDARY PALATE form: (1) Post. 2/3 hard palate, (2) max .canines & posterior teeth (3) soft palate (4) uvula |
DEHA Ch 5, p 53
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Explain the completion of the palate.
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Completion of Palatal Formation
it is the FUSION of three processes (1) primary palate (2) two palatal shelves (secondary palate) (3) |
DEHA Ch 5, p 53
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What are the developmental disturbances that can occur with the formation of the palate and related tissues?
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Developmental Disturbances:
Cleft Palate- the failure of FUSION on the palatal shelves with each other or the the primary palate often missing lateral incisors at site of fusion |
DEHA Ch 5, p 54
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Describe the formation of the nasal cavity and septum.
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Nasal Cavity and Septum Dev.
9th-12 week (1) Fusion of medial nasal process (2) Nasal septum fuses w/final palate (3) Completion helps separate nasal cavity from ORAL CAVITY |
DEHA Ch 5, p 56
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What does the tongue develop from and when?
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Tongue Development (4th - 8th weeks)
FROM: swellings of primitive pharynx (first 4 branchial arches) BODY of Tongue: 1st branchial arch BASE of Tongue: 2nd, 3rd, 4th branchial arch |
DEHA Ch 5, p.57
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Explain the development of the body of the tongue.
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Body of Tongue Development (1st branchial arch)
OCCURS in 4th week from: (1) tuberculum impar (medium tongue bud) (2) lateral lingual swellings (distal tongue buds) ***forms anterior 2/3 of tongue |
DEHA Ch 5, p.57, Table 5.2
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Explain the development of the base of the tongue.
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Base of Tongue Development (2-4th branchial arches)
OCCURS: (1) Copula (swellings from 3rd branchial arch) overgrowing 2nd branchial arches (2) Epiglottis swelling-from 4th branchial arch ***Forms posterior 1/3 of tongue |
DEHA Ch 5, p.57, Table 5.2
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How does tongue formation become complete?
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Completion Tongue Formation (8th wk)
Posterior swelling "Copula" (Tongue Base) MERGING with the anterior swellings of the 1st branchial arch (Tongue Body) FUSION marked by Sulcus Terminalis (inverted V-shaped groove) separates ant. 2/3 from post. 1/3 |
DEHA Ch 5, p.57
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