Developmental Biology (Bio 445)

Lecture Guide

(pages 48-60 Moore)

 

Class note: We will NOT be covering material in Wolpert chapter 4 on Friday

 

During cleavage, the potential to generate multiple embryos exists.

 

        Twins – ___________ (USA); triplets ________________

       

        ______________ – twins resulting from __________________ ________________________________________________________

        _______________– twins resulting from __________________ ________________________________________________________

        ______________ – results from _________________________ ________________________________________________________

 

Second week of Development:

 

_______________ of the _____________commences at the end of the first week and is completed by _________________________.

 

Sites of implantation:

        ________________ – normally occurs in _______________ of the uterus.

                ______________ – implantation over the opening of the ______________________________________________________

 

        _____________ – (Ectopic – ____________ births USA)

-         usually occurs in ___________________________

-         ________________ at 2.5 months

 

 

 

 

 

___________ cavity – small cavity which forms _______________ __________________

 

___________ – a thin membrane of cells ____________________ ______________________________________________________

-         The ____________ are derived from cells of ____________

-         Will eventually __________________ the embryo

 

__________________ – remainder of the __________________ that becomes flattened into ___________________________.

 

1.      ______________________________ -  small ________cells adjacent to the ________________________________.

2.      ____________ – the thicker layer of ________________ cells facing the _____________.

 

___________________– formerly the ____________________.

 

_______________________ – lining of the ______________ which ___________and ________________________ from ____________ ___________________ to the embryo

 

__________________ – the ________________________________. 

 

 

 

____________________________ – derived from the ____________ ________________________________________________________

 

__________ – isolated cavities in the _________________________

-         become filled with _________________________________ ________________________________________________

-         the fluid (aka ______________) passes to the ________ ________________________________________________.

-         This is the beginning _______________________________.

 

AT 10 and 12 days, the _______begin to fuse into ______________, which receive _______________________________ and give the _____________________________________________ appearance.  Maternal blood from __________________, allow blood to pass into and out of the ______________________ establishing the primitive ________________________________________. 

 

 

_____________________ – this _________________forms from the ___________________________________________ as the primary yolk sac is ___________________.

 

_________________ – form near the end of the ____________ as cellular extensions of _____________________- projecting into the _________________________-

 

The _________________________ splits the __________________ _____________ into 2 layers:

-         ___________________ – lining ___________ and covering the ________________.

-          __________________ – surrounding the ______________.

 

___________ – the extraembryonic __________ + _____________.  This forms the wall of the ________________ within which the _______________________________________________________ _______________________________________________________

 

____________________ is an early measurement of ___________ and pregnancy _________________-.

 

_____________________ – the ___________________________