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Cards In This Set
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What is in the ectoderm, mesoderm, and endoderm?
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Ectoderm- skin, brain, spine, hair, nails, enamel,lining of oral cavity
mesoderm- bones muscles, circulatory system, kidneys, reproductive system, dentin, pulp and cementum endoderm- lining of lungs, lining of digestive system, genital system |
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What is embryology?
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Study of prenatal development
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What are the stages of prenatal development?
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Preimplantation period, takes place during the first week, the egg becomes a zygote.
Embryonic period 2nd week to the 8th week- this period is the most critical time. it develops all major structures. the fetal period- the 9th week and on. |
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What is the stomodeum?
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The primitive mouth.
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What are the 2 branchial arches?
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Mandibular arch- forms bones, muscles, and nerves of the face.
Hyoid arch forms the styloid process, stapes of the ear, stylohyoid ligament and part of the hyoid bone. |
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What is the primary palate and the secondary palate?
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The hard and soft palate are made by the fusion of the primary and secondary palate. This fusion forms a y shaped pattern in the roof of the mouth.
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Describe facial development.
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1st month- overhanging forehead is the dominant feature
2nd month- growth of nose and upper maxilla occur, mandibula lags behind. 3rd month- large head but resembles human 4 month- face looks human hard and soft palates are formed last trimester- sucking pads are formed, fat in cheeks |
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What are environmental and genetic factors in embryo development?
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Genetic- small jaw and big teeth, small teeth large jaw
environmental- teratogens (infections), radiation, medications |
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What are osteoblasts/clasts?
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Osteoblasts are responsible for the formation of bones
osteoclasts are responsible for resorption, the bones are taken away (resorbed) into the body. |
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What happens in the bud stage?
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(initiation) the beginning development of each tooth.
dental lamina is formed, which produces tooth buds for primary teeth. |
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What happens in the cap stage?
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Proliferation occurs, cells of tooth grow and increase in number. ectoderm layer because the enamel organ, mesoderm layer becomes dental papilla and will form dentin and will form a dental sac and give rise to cementum.
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What occurs in the bell stage?
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Histodifferentiation occurs; epithelial cells become ameloblasts- which are enamel-forming cells.
peripheral cells of dental papilla become odontoblasts- dentin forming cells. dental sac differentiate into cementoblasts- cementum forming cells. |
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The basic shape and size of each tooth are established during what process?
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Morphodifferentiation.
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The DEJ and cementodentinal junction act as what?
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A blueprint for the tooth.
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The development and the root occur after what formation has reached?
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Cementoenamel junction (CEJ)
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