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Questions and Answers
List the periods of prenatal development in the correct sequence and indicate their duration.
List the periods of prenatal development in the correct sequence and indicate their duration.
How long does the proliferative period last?
How long does the proliferative period last?
Indicate the duration of the embryonic period:
Indicate the duration of the embryonic period:
Which statement is true?
Which statement is true?
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Give a brief description of the gastrulation process.
Give a brief description of the gastrulation process.
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Nervous system, sensory system, epidermis, mammary and cutaneous glands, epithelium of oral and nasal cavities, and tooth enamel develop from:
Nervous system, sensory system, epidermis, mammary and cutaneous glands, epithelium of oral and nasal cavities, and tooth enamel develop from:
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Bone cartilage, blood, dentin, pulp, cementum, and periodontal ligament develop from:
Bone cartilage, blood, dentin, pulp, cementum, and periodontal ligament develop from:
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Name the parts of the embryonic tube:
Name the parts of the embryonic tube:
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Study Notes
Prenatal Development
- Periods of prenatal development occur in sequence: proliferative (first two weeks), embryonic (weeks 2-8), fetal (until birth)
- Proliferative period lasts two weeks
- Embryonic period lasts from the end of the second to the 8th week.
Gastrulation Process
- Gastrulation, occurring from the 14th to 20th day, involves the stratification of ectoderm and endoderm and an intermediate layer.
- Mesoderm develops between ectoderm and endoderm.
- This process starts in the cranial part of the embryo and progresses caudally.
Neurulation
- Neurulation is a process that occurs around the 20th day.
- This process involves the differentiation of cells from the ectoderm, which then forms a neural plate.
- The neural plate invaginates to form the neural groove.
- Neural folds close, creating the neural tube, which later forms the brain and spinal cord.
Nervous System Development
- Nervous system, sensory system, epidermis, mammary, and cutaneous glands, epithelium of oral cavities, and tooth enamel develop from the ectoderm.
- Bone, cartilage, blood, dentin, pulp, cementum, and periodontal ligament develop from the mesoderm.
Embryonic Tube
- Parts of the embryonic tube include pars cranialis, pars umbilicalis, and pars caudalis.
Neural Tube
- The neural tube forms after the neural groove deepens.
- The neural tube forms the spinal cord and the primitive brain.
Other Key Points
- The statement that the cells of the inner cell mass are the progenitors of the embryo is true.
- The statement that the future embryo is formed on the outside of the inner cell mass is false.
- The process of gastrulation begins at the end of the second embryonic week.
- The thickening of the surface of the primitive ectoderm is called the primitive plate.
- The mesoderm is responsible for the formation of bones, muscles, and other structures.
- On the 17th day, the notochord forms.
- The paraxial mesoderm is responsible for primary induction of the notochord.
Tooth Germ
- The tooth germ comprises the enamel organ, dental papilla, dental sac.
- Physiological stages in the tooth development include early root development, late root development, histodifferentiation, morphodifferentiation, mineralization, maturation, and eruption.
- The order of the physiological stages: initiation, proliferation, histodifferentiation, morphodifferentiation, apposition, maturation, eruption.
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Description
Explore the stages of prenatal development, including the proliferative, embryonic, and fetal periods. Understand the processes of gastrulation and neurulation, which lay the foundation for the development of the nervous system and other structures. This quiz covers key concepts essential for understanding human development.
