Z3224449

WEEK 2 LAB 1

1) What is the protein that sperm bind to on the egg surface:

Zona pellucida lypoprotein ZP3

2) Name the 3 stages of follicle development in the ovary:

i)primordial follicle ii)preantral follicle iii)antral (graffian) follicle

WEEK 3 LAB 2

--Elide Newton 13:13, 6 August 2009 (EST)

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

hCG( Human chorionic gonadotropin)

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

Hormones progesterone and estrogen

3. What are the 2 main tissues to be derived from the germ cell layer continuous with the lining of the amniotic sac?

ectoderm forms 1)the nervous system from the neural tube and neural crest and 2) the epithelial layer of skin covering the embryo

WEEK 4 LAB 3

--Elide Newton 13:40, 13 August 2009 (EST)

1) What period of human development (in weeks) do the 23 Carnegie stages cover?

The first 8 weeks

2) What part of the somite will contribute to the vertebral column?

The sclerotome part of the somite forms the vertebral bodies and intervertebral disc.

3) At what Carnegie stage does the human neural tube normally completely close?

Stage 13

WEEK 5 LAB 4

--Elide Newton 13:41, 20 August 2009 (EST)

1. Into what structure do most blood vessels empty before they enter the embryonic heart?

The Sinus venosus

2. What do the dorsal aortas become in the adult?

The descending thoracic aorta

3. What are the layers of cells found in a tertiary villi? There are 4 layers:

• Trophoblast layers of syncitiotrophoblast and cytotrophoblast
• Extra-embryonic mesoderm layer
• mesenchymal layer which differentiates into blood vessels and cells.

WEEK 6 LAB 5

--Elide Newton 13:24, 27 August 2009 (EST)

1. What was the question I said in the respiratory lecture would be part of this week's assessment?

Congenital Diaphragmatic Hernia where the pleuroperitoneal foramen fails to close, is more common on one side of the diaphragm than the other.

2. What is the answer to the above question?

The majority occur on the left side ( approximately 80% or cases)