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Developmental
Lecture 6
| Question | Answer |
|---|---|
| Embryogenesis is to | Amniotes-Birds |
| Blastodisc | is a blastoderm for organisms that undergo meroblastic cleavage |
| Types of Amniotes | Reptiles, Birds, Mammals |
| Amniotes embryo is | completely enclosed in a protective membrane called amnion |
| In birds oogenesis | produces a large egg in which the yolk is produced in the liver. On top of the yolk is a large cytoplasmic disc. The nucleus is within this disc and it undergoes meiosis |
| _______ cause the egg to be released into the infundibulum where it is fertilized. | Hormones - after the egg continues into the magnum portion of oviduct where egg white proteins are added |
| ______ and _____ are egg white proteins | Ovalbumin and lysozyme - lysozyme destroys bacteria. Shell membrane is added in the isthmus and then to the uterus where calcium carbonate shell is deposited. |
| The bird reproduction tract | during early development epiblast, hypoclast, blastoceol, and subgerminal space will form. Area pellucid and area opaca becomes syncytial |
| The posterior end is calle | the posterior marginal zone and will get a thickened area called kollers sickle. |
| _____ _____ is higher in the oviduct and there fore is less yolky. gravity plays a role in this process | Kollers sickle |
| The epiblast forms the | embryo |
| the hypoblast forms | extra embroyonic tissue |
| Movement of the cells at kollers sickle creats a thickening called the _____ _____ | primitive streak |
| The primitive streak extends ____ as cells are added. | anteriorly |
| A depression in the center of the primitive streak corresponds to the _____. | Blastpore |
| A thickening at the anterior end corresponds to the dorsal blastopore lip and is called ____ ____ | hensens node |
| Cells will pass through hensens node and form the most anterior structures of the ____ | embryo - meanwhile hensens node migrates posteriorly obliterating the primitive streak and causes mesodermal and endodermal precursor to ingress though the primitive groove to the blastocoel |
| Hensens node migrates posteriorly obliterating the primitive streak and causes mesodermal and endodermal precursor to ingress though the ____ ____ to the blastocoel | primitive groove |
| Mesodermal precursors remain in the ______ forming loosely connected mesenchyme | blastocoels |
| Endodermal precursors displace cells in the center of the _____ | hypoblast |
| Ectodermal precursors remain in _____ which spread to via _____ to surround the yolk. | epiblast epiboly |
| Hensens node passes posteriorly obliterating the primitive streak referred to as the ____. | tailbud |
| Embryo lengthens and the node produces posterior _____ and _____ | structures and somites |
| Chick embryo- Four extraembryonic membranes | Chorion, allantois, yolk sac, amnion |
| chick embryo - chorion | outer layer of protection |
| chick embryo - allantois | highly vascularized |
| chick embryo - yolk sac | highly vascularized |
| chick embryo - amnion | inner layer of proestion |
Created by:
AshCha
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