Palate and Sensory Organ Development Flashcards
Stomadeum
Small depression at the base of the brain
Precursor of the mouth and the anterior lobe of the pituitary
Primary palate
Derived from the intermaxillary segment
Has philtrum and 4 top teeth
Secondary palate
Has 2 shelf-like outgrowths (palatine shelves) from the maxillary prominences
Fused to form the definitive palate
Highly sensitive to teratogenic chemicals
How do you get a cleft palate?
If the shelves fail to lift up above the tongue and fuse
2 lateral lingual swellings and one medial swelling originate from __ arch and give rise to __
1st pharyngeal arch
The tongue
Copula or hypobrnahcial eminence
Formed from the mesoderm of the 2nd, 3rd, and part of the 4th pharyngeal arch
Second medial swelling that contributes to the tongue development
What 2 cranial nerves innervate the tongue?
Trigeminal
Glossopharyngeal
External and middle ears arise from…
The first and second pharyngeal arches
Intervening pharyngeal cleft, membrane, and pouch
Inner ear develops from..
Ectodermal otic placode
What layer is neural crest and mesenchyme?
Mesoderm
What does the inner vs outer wall of the optic cup give rise to?
Inner: neural retina
Outer: pigmented epithelium
Neural retina
Gives rise to the 6 types of neuronal cells and one glial cell
Optic stalk
Connects the optic cup to the diencephalon
Lens placode
Contact with the optic cup is necessary for the maintenance and development of the lens placode
Gives rise to lens vesicle
Shh expression in the optic cup
Makes the optic cup more ventral
Always what it does!
