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.