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Describe the stages of palatal development.
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
What is the difference between the primary and secondary palate? To what does each give rise?
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
Explain the completion of the palate.
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
What are the developmental disturbances that can occur with the formation of the palate and related tissues?
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
Describe the formation of the nasal cavity and septum.
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
What does the tongue develop from and when?
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
Explain the development of the body of the tongue.
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
Explain the development of the base of the tongue.
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
How does tongue formation become complete?
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