Annals of anatomy = Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft · 2026
Palatal shelf integrated into tissue segment derived from maxillary process: A comparative study of the growth of its parts during the human embryonic period.
СтатьяСравнительное исследованиеНазвание и аннотация: Перевод в очереди
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Nebot-Cegarra Josep, Cueto-González Anna Maria
Аннотация
OBJECTIVE: To analyse the volumetric dynamics of the maxillary palatal segment (MPS), comprising the palatal shelf and adjacent tissues derived from the maxillary process.
MATERIAL AND METHODS: Twenty-eight MPSs were delineated in coronal or quasi-coronal histological sections of the heads of 14 human embryos at Carnegie stages (CS) 18-23. These were divided into palatal and juxtapalatal zones and anteroposterior thirds. The MPSs were classified into seven developmental degrees, based on the palatal shelf phases (preprimordial, vertical, and horizontal) and the embryo's CS. The volume of each third was measured, and the percentage of the MPS volume it represented was calculated. The mean percentage of volume in the thirds of the MPSs at the same developmental degree served as the comparison parameter.
RESULTS: During the vertical phase, the anterior palatal third exhibited the greatest volume percentage. Its primary growth occurred at the beginning of shelf formation, after which it stabilised. After the palatal elevation (horizontal phase), the percentages of the palatal thirds initially equalised, but later the middle and posterior thirds surpassed the value of the anterior third, with their internal parts increasing significantly, particularly in the posterior third; moreover, the concordance between the opposing sign volumetric changes in neighbouring thirds suggests mesenchymal transfer from the juxtapalatal thirds.
CONCLUSION: The percentage distribution of MPS volume during human embryonic palatogenesis emphasises: (1) stability in the anterior third; (2) expansion in the middle and posterior thirds, particularly in the internal parts, closely linked to the elevation and horizontal progress of the palatal shelf.
MATERIAL AND METHODS: Twenty-eight MPSs were delineated in coronal or quasi-coronal histological sections of the heads of 14 human embryos at Carnegie stages (CS) 18-23. These were divided into palatal and juxtapalatal zones and anteroposterior thirds. The MPSs were classified into seven developmental degrees, based on the palatal shelf phases (preprimordial, vertical, and horizontal) and the embryo's CS. The volume of each third was measured, and the percentage of the MPS volume it represented was calculated. The mean percentage of volume in the thirds of the MPSs at the same developmental degree served as the comparison parameter.
RESULTS: During the vertical phase, the anterior palatal third exhibited the greatest volume percentage. Its primary growth occurred at the beginning of shelf formation, after which it stabilised. After the palatal elevation (horizontal phase), the percentages of the palatal thirds initially equalised, but later the middle and posterior thirds surpassed the value of the anterior third, with their internal parts increasing significantly, particularly in the posterior third; moreover, the concordance between the opposing sign volumetric changes in neighbouring thirds suggests mesenchymal transfer from the juxtapalatal thirds.
CONCLUSION: The percentage distribution of MPS volume during human embryonic palatogenesis emphasises: (1) stability in the anterior third; (2) expansion in the middle and posterior thirds, particularly in the internal parts, closely linked to the elevation and horizontal progress of the palatal shelf.