ANAT2341 Lab 1

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2. Preimplantation and Early Implantation Lab


This laboratory will look at preimplantation and early implantation development. We will be using models and a range of fixed embryo material and worksheets to explore these topics.

The best way of beginning to understand the sequence is by considering the "stages" of development in relation to age (in days or weeks). Stages are based on the external and/or internal morphological development of the vertebrate embryo, and are not directly dependent on either age or size.

Historically, the human embryonic period proper is divided into 23 Carnegie stages and criteria beyond morphological features include age in days, number of somites present, and embryonic length have sometimes been included in the stage descriptions. These stages are also shown in the movie Carnegie stage human growth through embryonic period.


  1. Understand the conceptus changes during in the first month after fertilization.
  2. Identification of the preimplantation stages
  3. Understand the process of gastrulation and the trilaminar embryo.
  4. Understand the development of the germ layers: mesoderm and ectoderm.
  5. Identify abnormalities associated with this period of development.


A link to the online exercises will be provided on Moodle.