- Shuffle
Toggle OnToggle Off
- Alphabetize
Toggle OnToggle Off
- Front First
Toggle OnToggle Off
- Both Sides
Toggle OnToggle Off
Front
How to study your flashcards.
Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key
Up/Down arrow keys: Flip the card between the front and back.down keyup key
H key: Show hint (3rd side).h key
PLAY BUTTON
PLAY BUTTON
22 Cards in this Set
- Front
- Back
|
When is implantation of the blastocyst complete?
|
during the second week
|
|
What morphologic changes occur in the blastocyst embryoblast during implantation?
|
production of a bilaminar embryonic disc composed of epiblast and hypoblast
|
|
What does the embryonic disc give rise to?
|
germ layers that form all the tissues and organs of the embryo
|
|
What are some extra embryonic structures that form during the second week?
|
amniotic cavity, amnion, umbilical vesicle (yolk sac), connecting stalk and chorionic sac.
|
|
What does the trophoblast differentiate into?
|
cytotrophoblast, syncytiotrophoblast
|
|
What is the cytotrophoblast?
|
a layer of cells that is mitotically active and forms new cells that migrate to the syncytiotrophoblast, where they fuse and lose their cell membrane
|
|
What is the syncytiotrophoblast?
|
a rapidly expanding multinucleated mass in which there are no discernible cell boundaries. It invades the endometrial connective tissue and the blastocyst embeds itself in the endometrium.
|
|
What are decidual cells?
|
degenerate cells around the implantation site that are engulfed by.
|
|
What hormone is produced by the synctiotrophoblast?
|
human chorionic gonadotropin
|
|
How does hCG enter the maternal blood?
|
lacunae
|
|
What does hCG do?
|
maintains the hormonal activity of corpus luteum
|
|
What is the corpus luteum?
|
an endocrine glandular structure that secretes estrogen and progesterone to maintain the pregnancy
|
|
What is the primordial of the amniotic cavity?
|
a small space in the embryoblast that appears as implantation of the blastocyst occurs
|
|
What are amnioblasts and where do they come from?
|
amniogenic (amnion-forming) cells that separate from the epiblast and form the amnion, which encloses the amniotic cavity.
|
|
What is the embryonic disc?
|
a morphological change in the embryoblast that results in for formation of a flat, bilaminar plate consisting of two layers
|
|
What is the epiblast and what does it form?
|
One of two layers of the embryonic disc. Thicker and composed of high columnar cells related to the amniotic cavity. Forms the floor of the amniotic cavity and continuous peripherally with the amnion.
|
|
What is the hypoblast?
|
One of two layers of the embryonic disc. Consists of small, cuboidal cells adjacent to exocoelomic cavity. Forms the roof to the exocoelmic cavity and is continuous with the thin exocoelomic membrane.
|
|
What lines the primary umbilical vesicle?
|
hypoblast and exocoelmic membrane.
|
|
Between what two spaces does the embryonic disc lie?
|
amniotic cavity and umbilical vesicle
|
|
Extraembryonic mesoderm is formed by cells from where?
|
cells from vesicle endoderm form a layer of connective tissue, extra embryonic mesoderm
|
|
What are lacunae?
|
Cavities in the synctiotrophoblast that become filled with a mixture of maternal blood from ruptured endometrial capillaries and cellular debris from eroded uterine glands.
|
|
What is embyrotroph?
|
fluid in lacunar spaces that passes into the embryonic disc by diffusion and provides nutritive material to embryo.
|
