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23 Cards in this Set
- Front
- Back
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What is embryology?
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Development of a baby starting at conception and ending at the end of the 8th week.
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What is the embryonic period?
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Beginning of 3rd week to end of 8th week
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All essential structures for speech and hearing form during the embryonic period. (T/F)
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TRUE
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What are gametes?
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Sexual Germ Cells; male is sperm and femal is egg or ovum
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What is the new cell formed from the union of two gametes?
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Zygote or fertilized egg
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Where and When does the union of two gametes occur in the female's body?
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In the uterine tube, 12-24 hours after conception during ovulation
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After a zygote is formed, what occurs next?
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Cleavage or mitotic cell division. 2 becomes 4 then 4 becomes 8.
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After Cleavage what is the next stage?
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The morula, about the 3rd day after fertilization, and there are about 12-16 cells.
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Trophoblasts
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Cells have continued to divide after the morula stage, and cells begin to move. Some form to the outer edge which is what these cells are.
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What do the outer cells (trophoblasts) eventually form?
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placenta
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after the morula stage, and cells begin to move. Some form the inner cell mass which is what these cells are.
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embryonic tissue
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Implantation of the Blastocyst begins between the _ and _ day and is completed by the _ day
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5th, 7th, 10th
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The morula stage comes about the _ day of fertilization
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3rd
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Name two parts of the Blastocyst
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Trophoblasts and Inner Cell Mass
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Trophoblasts surround what
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the inner cell mass
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Once the blastocycst has completed implantation, cells begin to
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differentiate at week two
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What are the primary germ layers of blastocyst cell differentiation?
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Ectoderm, mesoderm, endoderm
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Decribe Ecotoderm
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Upper layer of the primary germ layer differentiation of the blastocyst, forms epidermis of skin, teeth, nervous system, hair, nails, and epithelial tissue
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When are the primary germ layers of blastocyst cell formed?
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Week two and cells differentiate
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Describe Mesoderm
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Middle/Between layer of the primary germ layer differentiation of the blastocyst, forms connective tissue, bones, muscles, blood vessels and cartilage
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Decribe Endoderm
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Lower/Inner layer of the primary germ layer differentiation of the blastocyst, forms epithelial lining of the digestive tract and respiratory tract
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Attachment to the uterine lining occurs in what stage?
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during the blastocyst stage
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Implantation or _______ happens during the blastocyst stage
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attachment to the uterine lining
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