Chapter 22, Problem 8RQ

Summary Introduction

To determine:

The embryonic origin of the trachealis and smooth muscle around the bronchi.

Introduction:

There are three embryonic layers, namely ectoderm, mesoderm, and endoderm which appear in the initial stages of embryo development. The structures of the upper respiratory tract include the pharynx, bronchi, and the trachea. They give rise to various structures of the human body and are also called germ layers.