From Embryology

--Julianna Lam 13:42, 17 September 2009 (EST)lab 1


1-what is the protein that the sperm binds to on the surface of the egg 2- name the three stages of follicle development in the ovary

answer 1-Zona pellucida lypoprotein ZP3 2/ premodal, pre-antral, antral --Julianna Lam 13:07, 6 August 2009 (EST)

lab 2 6/8/09


  1. What factor do the synctiotrophoblast cells secrete to support the ongoing pregnancy?
  2. What does the corpus luteum secrete to prevent continuation of the menstrual cycle?
  3. What are the 2 main tissues to be derived from the germ cell layer continuous with the lining of the amniotic sac? 


1.Human Chorionic Gonadotropin (hCG), a hormone that acts on cells in the ovary and stops the menstrul cycle. 2.progesterone,this maintains the thick lining of the endometrium 3.nervous system and skin tissue --Julianna Lam 13:08, 13 August 2009 (EST)

lab 3 questions 13/8/09

1/ What period of human development (in weeks) do the 23 Carnegie stages cover? 2/What part of the somite will contribute to the vertebral column? 3/At what Carnegie stage does the human neural tube normally completely close?

answer 1/ 8 weeks 2/the sclerotome forms the vertebral column 3/stage 13 ( week 4 ) the neural tube normally completely closes --Julianna Lam 13:39, 27 August 2009 (EST)

Lab 4 Questions

  1. Into what structure do most blood vessels empty before they enter the embryonic heart?
  2. What do the dorsal aortas become in the adult?
  3. What are the layers of cells found in a tertiary villi?

answer 1. 2. segmental arteries --Julianna Lam 13:07, 3 September 2009 (EST)

Lab 6 Questions

  1. Which is the more common clefting, cleft lip or cleft palate?
  2. What structures does pharyngeal pouch 1 form?
  3. Neural crest forms which cells within the skin? 

1. cleft lip is more common 2. pharyngeal pouch 1 forms these specific structures - tympanic membrane, tympanic cavity, mastoid antrum, auditory tube. the overall structure that the pharyngeal pouch 1 forms is the tubotympanic recess. 3. neural crest cells froms melanocytes within the skin

--Julianna Lam 13:43, 17 September 2009 (EST)

Lab 7 Questions

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

2/What changes would I expect to see in the muscle fibre types in my legs if I: a) Suffered a spinal cord injury b) Took up marathon running


1/ a myotube is a multinucleated but undifferentiated contractile apparatus. The nuclei of the myotube is located centrally in the muscle fibre. Several myoblasts undergoes frequent divisions and fuses together to form the multinucleated myotubes.

2 a/ changes in contraction time ( from fast to slow ) size of motor neuron ( large to small ) b/ changes in resistance to fatigue, maximum duration of use, mitochondrial density, capillary density


--Antonio Lee 15:10, 31 October 2009 (EST) Lab 10 Questions: 0/3 Correct.

--Julianna Lam 13:11, 24 September 2009 (EST)

--Julianna Lam 13:44, 1 October 2009 (EST)

--Julianna Lam 13:23, 15 October 2009 (EST)

--Julianna Lam 13:12, 22 October 2009 (EST)