Chapter 21, Problem 21.5.4AYLO

Summary Introduction

To determine:

The routes of embryonic venous drainage via the cardinal veins, vitelline veins, and umbilical veins.

The fate of the cardinal veins.

Introduction:

The formation of blood vessels at the embryonic stage and even after birth is termed as angiogenesis. Initially, angiogenesis occurs after 13 to 15 days of gestation period. During this time, the embryo is attached to the uterus via the embryonic stalk and is divided into three layers, endoderm, ectoderm, and mesoderm.