Term
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Definition
~0-2 weeks
Involves the processes of fertilization, cell cleavage, implantation, and placental formation. |
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Term
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Definition
~3-8 weeks.
Involves the processes of germ cell layer formation, gastrulation neurulation and organogenesis. |
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Term
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Definition
~9-36 weeks.
Involves the further development and maturation of all organ systems. |
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Term
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Definition
Produced by the testes.
*Helps to regulate the production of sperm cells. |
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Term
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Definition
| Sperm cells along with protective chemicals and nutrients that are added by ducts during ejaculation. |
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Term
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Definition
| Formed from three groups of cells called germ layers that are arranged as layers. |
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Term
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Definition
| The outermost layer of the embryo. |
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Term
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Definition
| The middle layer of the embryo. |
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Term
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Definition
| The innermost layer of the embryo. |
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Term
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Definition
| Release a single ovum during ovulation. |
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Term
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Definition
| Formed during fertilazation by fusion of egg and sperm. |
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Term
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Definition
Often termed as conception. Occurs in uterine tubes before implantation in uterine wall.
*Fusion of egg and sperm. |
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Term
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Definition
| Formed from the zygote during a rapid process of cell division (mitosis) called blastulation. |
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Term
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Definition
One of the three structures of the Blastocyst.
*Develops into the chorion (part of the placenta). |
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Term
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Definition
One of the three structures of the Blastocyst.
*Eventually is detroyed by the developing embryo. |
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Term
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Definition
One of the three structures of the Blastocyst.
*Develops into the embryo. |
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Term
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Definition
| The lining of the uterine wall in which the blastocyst implamts. |
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Term
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Definition
| The inner mass cells of the Blastocyst divide and form distinct germ layers that will eventually become the tissues that form the embryo. |
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Term
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Definition
| Occurs through the process of mitosis — duplication and replication of all genetic material |
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Term
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Definition
| Occurs ~3 days after morula enters the uterine cavity and completed about 10 days after fertilization |
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Term
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Definition
— Supplies embryo and fetus with nutrients
— Removes waste products from embryo and fetus |
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Term
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Definition
Finger-like projections into the wall of the uterus.
— anchors embryo and fetus
— increases surface area to volume ratio
— secretes the hormone human chorionic gonadotropin (hCG) |
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Term
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Definition
-Formation of the Central Nervous System (CNS) — i.e. brain and spinal cord
-Formation of associated structures — e.g. eyes, ears, nose |
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Term
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Definition
| Formation of all the major organ systems begins, e.g. respiratory, cardiovascular, etc. |
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Term
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Definition
Mesoderm formation.
There are two different types of mesoderm that form most of the structures of the body. |
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Term
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Definition
One of the two types of mesoderm.
forms most connective tissue structures |
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Term
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Definition
| One of the two types of mesoderm that developes in paired blocks. |
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Term
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Definition
| a solid ball of cells that forms as a result of successive mitotic divisions (about 32-cell stage) |
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Term
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Definition
| 2-cell stage that takes ~ 30 hours to complete |
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Term
| human chorionic gonadotropin (hCG) |
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Definition
| Produced by the chorion. Stimulates the ovaries to produce estrogen and progesterone that help grow and maintain the placenta. |
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