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21 Cards in this Set
- Front
- Back
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Pregnancy
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Events that occur from the time of fertilization (conception) until the infant is born
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Conceptus
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The pregnant woman's developing offspring
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Gestation Period
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The time during which development occurs. It extends from the last menstrual period through birth, approximately 280 days.
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Preembryo
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Refers to the conceptus for 2 weeks after fertilization. This period of time is called the embryonic period.
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Fetus
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Refers to the conceptus from 9th week through birth. This period of time is called the fetal period.
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Infant
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Name for offspring once fetus is delivered via the birth process
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Blastomere
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A cell formed by cleavage of a fertilized ovum
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Morula
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A solid ball of cells resulting from division of a fertilized ovum, and from which a blastula is formed
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Blastula
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An animal embryo at the early stage of development. Also called blastosphere.
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Blastosphere
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A liquid-filled sphere whose wall is composed of a single layer of cells. Also called blastula.
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Blastocyst
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A mammalian blastula in which some differentiation of cells has occurred.
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Blastocoel
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The fluid-filled cavity of a blastula
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Trophoblast
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A layer of tissue on the outside of a mammalian blastula, supplying the embryo with nourishment and later forming the major part of the placenta.
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Cavitation
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Process which blastocoels result from
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Compaction
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Process which trophoblasts result from
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Embryoblast
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Inner group of cells that are bunched together on one side of the blastocyst. It will eventually give rise to the definitive structures.
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Cytotrophoblast
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Inner layer when the trophoblast divides
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Syncytiotropblast
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Outer layer when the trophoblast divides (next to the endometrium)
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Endoderm
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Linings and glands of digestive tract, respiratory system and reproductive tract
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Mesoderm
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Muscle, bone, cartilage, blood
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Ectoderm
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Skin, hair, nails, and much of the nervous system
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