2010 BGD Practical - Implantation to 8 Weeks

Introduction

The first Embryology practical covered gametogenesis, fertilization, implantation and early events of embryonic development. The third week is the begining of the embryonic period which continues through to week eight.

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. The human embryonic period proper is divided into 23 Carnegie stages. Criteria beyond morphological features include age in days, number of somites present, and embryonic length. These stages are also shown in the movie "Carnegie stage human growth through embryonic period" below.

Staging can be applied to all vertebrates, and most vertebrate embryos develop during the embryonic period in much the same way, we can directly compare the timing of development for different species.

2010 BGD: Lecture 1 | Lecture 2 | Practical 3 | Practical 6 | Practical 12