Lecture 1: Formation of Face, Tongue, and Oral Cavity Flashcards
what is the timeline of formative events?
- formation of face
- formation of tongue
- formation of palate and oral cavity
organizational level involved in the growth and development of an organ in an organ system
formation
inc. in weight and spatial dimension (shape) that an organ or organism undergo
growth
the growth of an organ or organism through various morphologic stages on its way to maturity
development
in what week is there a “crown and rump” at the stomodeum (becomes oral and nasal cavities)?
3rd week
borders of the stomodeum during the 3rd embryonic week
superior- frontal prominence
inferior- cardiac plate
posterior- buccopharyngeal membrane
in what week do the pharyngeal arches appear and disappear?
4th
what does arch one become?
right and left max facial processes and right and left mandibular facial processes
place where the upper maxillary and lower mandibular processes meet at either side of the stomodeum
commissura labiorum oris
what replaces the cardiac plate as the lower boundary of the stomodeum
mandib facial processes
what becomes the posteriolateral boundaries of the stomodeum
max facial processes
the nasal pits appear where?
frontal prominence
what 3 of the 7 facial processes are formed by the frontal prominence
1- medial nasal prominence
2- right lateral nasal prominence
3- left lateral nasal prominence
what 4 of the 7 facial processes are formed by the brachial arch I
- right/left max processes
- right/left mandib processes
what do the max processes become?
- upper part of cheeks
- lateral parts of upper lips
what do the mandib processes become?
- lower part of cheeks
- lower lip
- chin
what does cleft I become?
external auditory meatus
from what arch does the operculum arise from?
II (it becomes the neck below the external auditory meatus)(good place for cyst)
what does the operculum cover?
arches III and IV and clefts II, III, and IV
during what week does merging take place between the facial processes?
4th
bilateral and unilateral clefts occur if there is no merging by what week?
5th
what does the median nasal prominence become?
middle of the nose and philtrum
formation of the tongue and the rupturing of the buccopharyngeal membrane all occurs in what week?
4th
what 4 lingual swellings merge to become the tongue
- right/left lateral lingual swelling
- tuberculum impar
- copula
what is the only lingual swelling that is not derived from arch one
copula (second and third arch)(post. 1/3 of the tongue)
the partitioning of the stomodeum into the oral and nasal cavities occurs during what week?
6th
where does the primary palate arise?
inner surface of median facial process
where does the nasal septum arise?
primary palate
where do the palatine folds arise?
inner surface of max facial processes
the palatine folds have lining epithelium that is connected to an underlying mesenchymal tissue also called ____
ectomesenchyme (originates in ectoderm primary germ layer)
during what week week is there epithelial fusion between the primary palate and the palatine folds?
6th
