The Respiratory System

EMBRYONIC DEVELOPMENT OF THE LOWER RESPIRATORY SYSTEM

The larynx, trachea, and lungs originate as a ventral outgrowth of the foregut, just posterior to the pharynx. This outgrowth, the laryngotracheal groove, promptly forms two lateral branches called lung buds.

The laryngotracheal portion of the outgrowth lengthens as the body develops and soon each of the two lung buds begin to form many subdivided buds. These subdivisions form the beginnings of the tubular branches of the lungs.

The lungs continue to enlarge and press into the body cavity to either side of the heart. As they grow each carries a portion of the coelomic lining into the coelom to form the visceral pleural membranes.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STUDY TOPICS IN SEQUENCE

Overview of Respiratory System

Human Nasal Passages

Human Pharynx Regions

Human Larynx and Trachea

Human Bronchi and Lungs

Muscles of Human Respiration

Lower Respiratory Development

Fish Lungs/Air Bladders

Tetrapod Lungs

Lung Ventilation Systems

Gills of Vertebrate Animals

Things I Should Know