Flashcards in Formation of the Face, Tongue, and Oral Caviy Deck (39):
An organization level involved in the growth and development of an organ and an organism
Increase in weight and spatial dimensions that an organ or organism undergo
The growth of an organ or organism through various morphologic stage on its way to maturity
When does the formation of the face occur?
What occurs during the third embryonic week?
The Stomodeum appears
Crown to rump measurment is 3mm
Becomes the nasal and oral cavities between 6th-8th weeks
Boundaries of the Stomodeum
Superior = Frontal Prominence
Inferior = Cardiac plate
Posterior = Buccopharyngeal membrane
What happens in the 4th embryonic week?
Branchial arches and clefts appear (and disappear)
Becomes the right and left maxillary facial processes as well as the right and left mandibular facial processes
Comissura laborium oris derives from...
Derives from the place where the upper maxillary and lower mandibular processes meet at either side
Brachial cleft I becomes...
External acoustic meatus
Brancial cleft II becomes...
What replaces the cardiac plate as the lower boundary of the stomodeum during the 4th week?
Right and Left mandibular facial processes
What becomes the posterolateral boudaries of the stomodeum?
Maxillary facial processes
What happens when the nasal pits appear?
The frontal prominence becomes 3 processes:
-Right and Left lateral nasal facial processes
-Median nasal facial process
What replaces the frontal prominence as the superior border of the stomodeum?
Right and left lateral nasal facial processes
Median nasal facial process
Fate of the median nasal facial process
Midline of the nose
Philtrum of the upper lip
Fate of the lateral nasal processes
Lateral sides and ala of the nose
Infraorbital part of the face
Fate of the maxillary process
Upper part of the cheeks
Lateral parts of the upper lip
Fate of the mandibular process
Lower part of the cheeks
Fate of Arch II
Becomes an embryonic fold called the Operculum
Covers arches III and IV as well as clefts II, III, IV
Becomes the sides of the neck below the external auditoy meatus
What is the significance of the groove that forms between the maxillary and median nasal prominences?
It extends into the stomodeum
If the maxillary facial processes do not merge with the median nasal facial processes, it causes unilateral or bilateral clefting of the upper lip
What is the fate of the Buccopharyngeal membrane
It ruptures, allowing the opening to the foregut, which becomes the nasal and oral pharynx
Site of the anterior pillar of fauces
When does formation of the tongue occur?
4th embryonic week
What stars tongue formation?
Four lingual swellings appear along the ventral, inside surface of the mandibular proccesses and branchial arches I, II, and III
What occurs after the buccopharyngeal membrane ruptures?
The 4 lingual swellings merge to form the tongue
What are the 4 lingual swellings
2 Lateral lingual swellings
What becomes the anterior 2/3 of the tongue?
Tuberculum impar and 2 lateral lingual swellings
What becomes the posterior 1/3 of the tongue?
What is the tongue's position in the 5th week?
In the stomodeum
When does the palate start to form?
What structures enter into formation of the palate
Arises from the inner surface of the medial nasal facial processes
Arises from the primary palate
Arise form the inner surface of maxillary facial processes
Have lining epithelium that is connected to an underlying mesenchyme
How does the palate begin to form?
Palatine folds move from a vertical position lateral to the tongue, to a horizontal position above the tongue, creating a 'Y' with the edges of the anterior portion of the palatine folds and the primary palate. Mesenchyme tissues of the palatine folds and the nasal septum flow towards each other, this causes the lining epithelia of structures nasal and palatine folds to approach eachother.
What occurs in the 6th embryonic week?
Palatine epithelial fusion