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What forms the lateral boundaries of the stomodeum?
During which period does facial development occur mainly?
What does the common chin dimple result from?
What signaling regulates the process of movement of the medial nasal prominences toward the median plane?
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From where do the primordia of the auricles begin to develop by the end of the fifth week?
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Which structure develops from a rod-like thickening in the floor of the nasolacrimal groove?
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How does the nasolacrimal duct form?
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What happens between the 7th and 10th weeks in relation to the facial prominences?
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What is continuous with the rostral portion of the nasal septum formed by the frontal prominence?
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What persists to form the frenulum of the upper lip?
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What is the main source of connective tissue components in the facial and oral regions?
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What gives rise to the optic vesicles that form the eyes?
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Which of the following is true about facial development?
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What are the derivatives of the first pair of pharyngeal arches?
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Which part of the frontonasal prominence forms the forehead?
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What is the function of the periodontal ligament?
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Which structure is responsible for the eruption of deciduous or milk teeth?
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What is the function of ameloblasts in tooth development?
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During which stage of tooth development does the tooth take on the appearance of a bell?
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What is the origin of the mesenchyme that forms the dental papilla?
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When does the eruption of deciduous or milk teeth typically occur?
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What is the function of the dental sheath during tooth development?
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Which cells produce predentin and continuously provide it throughout the life of the tooth?
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What gives rise to a number of dental buds along the upper and lower jaws during tooth development?
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During which week does the oronasal membrane rupture, bringing the nasal and oral cavities into communication?
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What is the role of the trigeminal nerves (CN V) in the development of facial muscles?
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At what age do the maxillary sinuses reach full development?
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What contributes to altering the size and shape of the face during infancy and childhood?
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What is the critical period for palatogenesis?
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What forms the anterior and midline aspect of the maxilla?
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When do the lateral palatine processes assume a horizontal position above the tongue?
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What persists in the median plane of the palate between the anterior part of the maxilla and palatine processes?
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What develops from proliferation of cells lining them in the nasal cavities?
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Which pair of sinuses are not present at birth?
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The dental lamina forms a C-shaped structure along the length of the upper and lower jaws during tooth development.
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The mesenchyme cells in the dental papilla adjacent to the inner dental layer differentiate into ameloblasts.
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Enamel is first laid down at the neck of the tooth and from there spreads toward the apex.
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The crown is gradually pushed through the overlying tissue layers into the oral cavity as the root lengthens.
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The eruption of deciduous or milk teeth typically occurs 6 to 24 months before birth.
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The buds for permanent teeth form during the third month of development but begin to grow around the first year of postnatal life.
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The mesenchymal cells on the outside of the tooth differentiate into cementoblasts that produce specialized bone called dentin.
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The dental sheath is responsible for the resorption of deciduous teeth as permanent teeth grow.
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The fusion between the nasal septum and palatine processes is completed anteriorly during the 12th week of development.
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The irregular suture visible in the anterior region of the palates of young persons indicates where the embryonic primary and secondary palates fused.
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Study Notes
Development of the Face
- Facial development begins in the fourth week, dependent on the inductive influence of the forebrain, frontonasal ectodermal zone, and developing eye
- Five facial primordia appear as prominences around the stomodeum (mouth): frontonasal, maxillary, mandibular, and paired nasal placodes
- These prominences are produced mainly by the expansion of neural crest populations originating from the mesencephalic and rostral rhombencephalic neural folds
- The frontonasal prominence forms the forehead, nasal part, and orbits; maxillary and mandibular prominences form the lateral boundaries and caudal boundary of the stomodeum, respectively
Development of Palate
- Palatogenesis begins in the sixth week, involving the primary and secondary palates
- The primary palate, formed by merging medial nasal prominences, represents the anterior and midline aspect of the maxilla
- The secondary palate develops from two mesenchymal projections (palatal shelves) extending from the internal aspects of the maxillary prominences
- Lateral palatine processes assume a horizontal position above the tongue, eventually forming the hard and soft parts of the palate
Development of Nasal Cavities
- Nasal placodes (primordia of nasal epithelium) develop on the inferolateral parts of the frontonasal prominence
- Mesenchyme in the margins of the placodes proliferate, producing horseshoe-shaped elevations, the medial and lateral nasal prominences
- Nasolacrimal duct develops from a rod-like thickening of ectoderm in the floor of the nasolacrimal groove
- By the end of the sixth week, the nasal pits have formed, and the nasal cavities are separated from the oral cavity by the oronasal membrane
Postnatal Development of Paranasal Sinuses
- Paranasal sinuses, such as maxillary sinuses, begin to develop during late fetal life; others develop after birth
- Original openings of the diverticula persist as the orifices of the adult sinuses
- Maxillary sinuses grow slowly until puberty and are not fully developed until early adulthood
- Frontal and sphenoidal sinuses are not present at birth, but grow rapidly around 2 years of age
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Description
This quiz covers the embryological development of facial structures including the chin, lower lip, cheek regions, and nasal cavities. It includes the formation of nasal pits, nasal sacs, and their relationship to the developing forebrain.
