From Embryology
Revision as of 10:31, 16 September 2010 by Z3252083 (talk | contribs) (Attendance)



--Mary Nicolas 23:38, 28 July 2010 (UTC)

--Mary Nicolas 23:37, 4 August 2010 (UTC)

--Mary Nicolas 23:52, 11 August 2010 (UTC)

--Mary Nicolas 23:39, 18 August 2010 (UTC)

--Mary Nicolas 23:31, 1 September 2010 (UTC)

--z3252083 23:52, 1 September 2010 (UTC)

--Mary Nicolas 23:31, 15 September 2010 (UTC)

Lab One Questions

Cell Division lecture

Fertization- First diploid cell



Early zygote.jpg

Lab Two Questions

1. Syncytiotropoblast cells secrete:

• Progesterone which maintains the integrity of the uterine lining.

• Human chorionic gonadotropin (hCG) which prevents the degeneration of the corpus luteum.

• Human placental lactogen (HPL) which modifies the metabolic state of the mother during pregnancy to facilitate the energy supply of the fetus

2. The corpus luteum secretes progesterone (signalled by hCG secreted by the trophoblast cells of the blastocyst) which consequently maintains the endometrium which provides an area rich in blood cells so that the zygote can develop.

Lab Three Questions

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

Week 3: stages 7, 8 & 9

Week 4: stages 10, 11 & 12

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

2.6mm - 4.6mm (from 0.4mm in week 3 to 3-5mm in week 4)

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

Cranial- stage 11 (days 23-26)

Caudal - stage 12 (days 26-30)

Oct4 staining on USSC-derived spheres,[1]

Lab Four Questions

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

The vitelline vein, umbilical vein and the cardinal vein drain

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

The vitallene arteries contribute to the GI tract arteries; and the vitallene veins contribute to the adult portal system.

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



villi connective tissues

fetal capillary endothelium

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

Haematopoetic stem cells

Lab Five 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.

Carnegie stage 22

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

Pnuemocytes type 2/alveolar type 2 cells. These cells produce surfactant.

  1. <pubmed>20003538</pubmed>