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What is embryology?
the study of the development of an animal from the fertilized egg until the organs are formed (fetus).
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What is the purpose of the yolk?
nutrition of the early embryo.
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Do just bird eggs have yolks?
no. mammalian eggs do, too
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What is a zygote?
- a fertilized egg
- egg + sperm
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What is a fetus?
an animal from the time organ systems are developed until the time it is born
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Rapid division of the zygote is called _____.
cleavage
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Name the solid mass of cells formed from the zygote by cleavage.
morula
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As the embryo continues to grow, it develops into a hollow ball of cells called the _____.
blastula
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The placenta is formed from _____ tissue.
fetal
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What is implantation?
attachment of the embryo to the uterine wall
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Further growth of the blastula results in development of three embryonic germ layers. List these three layers and briefly describe their relative locations.
- ectoderm: outer layer
- mesoderm: middle layer
- endoderm: inner layer
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Define epithelium.
covering of internal and external surfaces of the body
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Define mesenchyma.
embryonic connective tissue
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Define carcinoma.
malignant tumor derived from ectoderm and endoderm tissue
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Define sarcoma.
malignant tumor derived from mesenchymal tissue
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Define blastoma.
neoplasm composed of embryonic cells.
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What structures are considered to be endothelium?
lining of heart, lining of blood and lymph vessels, lining of body cavities - pleura, peritoneum, pericardium
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What layer is nervous tissue?
ectoderm
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What layer is lymphoid tissue?
mesoderm
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What layer is muscle?
mesoderm
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What layer is the inner lining of the intestines - mucosa?
endoderm
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What layer is hair?
ectoderm
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What layer is the inner lining of lungs?
endoderm
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What layer is bone?
mesoderm
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What layer is skin?
ectoderm
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What layer is the dentin of teeth?
mesoderm
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What layer is the enamel of teeth?
ectoderm
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What is another word for ovum?
egg
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What is another word for morus?
mulberry
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What is another word for karkinos?
crab
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What is another word for sarkos?
flesh
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What does "meso-" mean?
middle
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What does "blasto-" mean?
bud, shoot, early stage of growth
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What does "germ-" mean?
bud, shoot, early stage of growth
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