From Embryology

Group 2

Chorionic Villus Sampling


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Lab Questions

Lab 1 Questions

Complete tasks associated with the online individual and group assessments including:

1. Demonstrate the ability to create an attendance signature.

2. Create a subheading, link and add an image to student page.

learning to use page

internal link Cell division

external link SMH

lecture 2


Early zygote.jpg

Search Pubmed

Search Bookshelf Chorionic villus sampling

Search Pubmed Now: Chorionic villus sampling

3. Vote here (with student signature) for the major topic for the group project before Lab 2.

Lab 2 Questions

1. What factor do the synctiotrophoblast cells secrete to support the ongoing pregnancy?

Syncytiotrophoblasts secrete Human Chorionic Gonadotropin (hCG) hormone, which prevents degeneration of the corpus luteum

2. What does the corpus luteum secrete to prevent continuation of the menstrual cycle?

Progesterone, which helps make the endometrial lining ready for implantation if an egg is fertilized. Progesterone also changes the endometrium to a secretory lining (from proliferative), which creates an ideal environment for the blastocyst.

Lab 3 Questions

1. What Carnegie stages occur during week 3 and week 4?

Carnegie stages 7 (gastrulation and notochord formation) to 13 (Somite no. 21-29, caudal neuropore closes)

2. What is the change in overall embryo size form the beginning of week 3 to the end of week 4?

embryo has grown 2.6mm to 4.6mm. (week 4. 3mm to 5mm - week 3. 0.4mm)

3. Approximately when do the cranial (anterior) and caudal (posterior) neuropores close in the human embryo?

Cranial neuropore closes at carnegie stage 11, which is 23-26 days

Caudal neuropore closes at carnegie stage 12-13, which is 26-30 days

Lab 4 Questions

1. Name the vessels that drain into the sinus venosus?

the three venous inputs that drain into the sinus venosus are the vitelline vein, umbilical vein and common cardinal vein

2. What is the fate of the vitelline artery and vitelline vein?

Vitelline arteries - arises from dorsal aorta, contribute to adult GIT arteries, fuse to become superior mesenteric artery

Vitelline veins - empties into sinus venosus, contribute to the adult portal system

3. Name the 4 layers that constitute the placental barrier?

syncitiotrophoblast, cytotrophoblast, villi connective tissue and fetal capillary endothelium

4. What stem cells are found in abundance, and may be harvested from the placenta for therapeutic uses?

hematopoietic stem cells

Lab 5 Questions

1. What is the origin of the gastrointestinal tract smooth muscle?

Splanchnic mesoderm

2. At what Carnegie stage does the buccopharyngeal membrane begin to break down?

Carnegie stage 11

3. Identify the lung developmental stage in late embryonic to early fetal period.

Lung development, budding of lungs from the trachea, starts to occur in Carnegie stage 22

4. In premature infant birth, which respiratory cell type may not have fully developed?

Pnuemocytes type 2 (or alveolar type 2 cells) which produce surfactant.

Lab 7 Questions

1. Briefly; what is a myotube and how is it formed?

myotubes are multi-nucleated cells which are formed by the the fusion of myoblasts

2. What changes would I expect to see in the muscle fibre types in my legs if I:

a) Suffered a spinal cord injury: muscle atrophy in the legs.

b) Took up marathon running: some of the fast muscle fibers in the legs would change to slow fibers.

Peer Review Task

Group 1: The layout is really easy to follow, everything seems to be in the right order and flow really well. i could easily follow what they had written. One thing i found especially impressive, was that they had taken the time to explain every image when you click on it. this would've taken a lot of time and effort that isn't immediately available to see, but helpful if you need to know more about the image, you just click on it. What could be improved: in one of the tables, under the heading minor signs of trisomies, pleuxs should be plexus. i didnt see any other spelling mistakes though. Also, it seems only one person has contributed most of the work, and there are three in the group. i found this to be the case for most pages.

Group 3: This project is very well written, and easy to follow. i loved the disorders section, with the table, graph and pictures it made it really easy to follow, and interesting! when you see a picture like the anencephaly one, it makes you stop and read what its about! I also like how many student drawn diagrams there are, they have really put in a lot of effort. I definitely learnt a lot from reading this page.

What could be improved: The ethics section has no references, also the current research section seems to be copied straight from the internet. there are also a few spelling mistakes in the ethics section - waranted=warranted, phsychological=psychological

Group 4: Felicias drawings are amazing! they go into so much detail and she has clearly put in so much effort in doing them! That was the first thing i noticed when looking at the page. I actually really like the overall feel of the page, and the bigger pictures help. The first two pictures really caught my attention and made me want to read all about PUBS. I did like all the dot points, because they made it a little easier to follow, but maybe a little simplistic.

Improvements: Under the sample analysis heading, they have put 'the' twice. just need to delete one. Under the disorders section, they have put that unlike PUBS, CVS and amniocentesis do test for neural tube defects. CVS doesnt test for neural tube defects, only amniocentesis. Alot of the page in not referenced. Other than that, awesome job!

Group 5: