01c Body cavities and diaphragm

Question 1

What are the pleuropericardial folds

Answer 1

They are small ridges projecting from the thoracic wall that separate the pleural ands pericardial spaces

Question 2

Explain the formation of the diaphragm

Answer 2

Pleuroperitoneal folds extend medially and ventrally and fuse with oesophageal mesentery and septum trnasversum

Pleuroperitoneal membrane separates thoracic and abdominal cavities. Further expansion of pleural cavities adds muscular rim to membrane

Question 3

What does the diaphragm consist of

Answer 3

Mesentery of oesophagus
Septum transversum
Pleuroperitoneal folds
Muscular rim

Question 4

What is the respiratory diverticulum

Answer 4

It is an outgrowth from ventral part of foregut

Question 5

What are the tracheosophageal ridges

Answer 5

They are the ridges that separate the diverticulum form the forgot as it expands caudally and they fuse medially to form the tracheosophageal septum.

Dorsal portion - Oesophagus
Ventral portion: Trachea and lung buds