# Human Embryology TL1/Two Layered Embryo

 Work in progress, expect frequent changes. Help and feedback is welcome. See discussion page.

# Preknowledge

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{{Objectives| In this unit we will review the processes that lead from fertilisation to the implantation of the embryo. We will build on our prior knowledge and examine in detail the process that leads a fertilized oocyte to become an implanted embryo.

# Competencies

 At the end of this unit you should be able to: Describe the different stages of development of the embryo as it travels down the fallopian tubes Predict the types of malformations that may be associated with disruption of any of the processes discussed

Activity
 During class, we will use the diagrams provided in the lecture notes to identify and label the different structures and use those as a platform to discuss the early processes of development. Figures associated with this topic: Fig 5.1 and Fig 5.2.

• Jacobsen Chapter 1 (Sections: 'The Xenopus embryo' and 'The mouse embryo')

# Assignment

 After class, you are expected to review your notes and read the assigned text material. You are expected to contribute to the questions and definitions sections below. Please use the discussion page if you want to discuss any particular topic on the material. You are also welcome to add links to videos or audio files in the Media box or links to online resources in the Web Resources box below.

# Question

 What do amphibian and mammalian gastrulation have in common?

# Question

## Definitions

You should be able to provide structural and functional definitions for the structures associated with this topic: (oviduct (aka fallopian tube), zygote, zona pellucida, morula, blastocyst, trophoblast, inner cell mass ).

Definition
 oviduct (aka fallopian tube):

Definition
 zygote:

Definition
 zona pellucida:

Definition
 morula:

Definition
 bastocyst:

Definition
 Blastocyst cavity (aka blastocoel):

Definition
 Inner cell mass:

Definition
 Cellular Trophoblast:

Definition
 Syncitial Trophoblast:

# Web Resources




Check out PZ Meyer's blog post on spiral cleavage.

# Related Content

Go back to the introductory page Continue with Unit 2 ([of the mammalian embryo])