Z3187802

From Embryology
Revision as of 02:04, 26 August 2009 by Z3187802 (talk | contribs)

--Vishnnu Shanmugam 13:09, 6 August 2009 (EST)--Mark Hill 21:58, 5 August 2009 (EST) Where are your answers from Laboratory 1 Assessment? --Vishnnu Shanmugam 13:09, 6 August 2009 (EST)



Lab 1 Questions:

1. What is the zona pellucida protein that binds spermatozoa to the oocyte surface? ZP3 glycoprotein

2. Name the 3 main stages of follicle development in the ovary?

       1)	Primordial follicle
       2)	Preantral follicle 
       3)	Antral follicle 



Lab 2 Questions:

1. What factor do the synctiotrophoblast cells secrete to support the ongoing pregnancy? Human Chorionic Gonadotropin (hCG) hormone

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

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

       1)	Epithelium of skin covering embryo
       2)	Nervous system from neural crest & neural tube


Lab 3 Questions:

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

       In human development, the Carnegie stages cover the first 8 weeks of embryonic development

2. What part of the somite will contribute to the vertebral column? The sclerotome

3. At what Carnegie stage does the human neural tube normally completely close? Carnegie Stage 13



Lab 4 Questions:

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 Decending Aorta

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

       Tertiary (placental) villi are composed of a core of villous capillaries (from mesenchymal cells) surrounded by an inner layer of mononuclear cells called
       cytotrophoblast and an outer layer of multinucleated cells called syncytiotrophoblast