Thoracic Cavity Development Flashcards
Pleural Cavities
Space in which lungs develop and persist
Pericardial Cavity
Space in which heart develops and persists
Peritoneal Cavity
Space in which abdominal viscera develops and persists
Herniation of small intestine and portion of large intestine
Septum Transversum
Will become the central tendon of the thoracic diaphragm
Intraembryonic Ceolum
Primordium of embryonic cavities
Develops during 4th week
Cranial End of Intraembryonic Ceolum
Future pericardial cavity
Embryo undergoes head fold to get pericardium and heart ventrocaudally to get position anterior to foregut
Caudal Limbs - Intraembryonic Ceolum
Future pleural and peritoneal cavities
Opens to extraembryonic ceolum
Mesenteries
Double layer of peritoneum that extends from abdominal wall
Dorsal Mesentery
Permanent Structure - conveys blood vessels, nerves, and lymphatics to organs
Ventral Mesentery
Remains attached to caudal part of foregut (liver)
Parietal Peritoneum
covers body wall
Visceral Peritoneum
covers organ
Pericardioperitoneal Canal Location
Lateral to foregut (esophagus)
Dorsal to septum transversum (diaphragm(
Cranial Ridges
Pleuropericardial Folds
Superior to developing lungs
Separate pleural from pericardial cavities
Caudal Ridges
Pleuroperitoneal folds
Inferior to developing lungs
separate pleural from peritoneal cavities
Pleuropericardial Membranes
Enlargement of pleurppericardial folds
Separate pleural from pericardial cavities
Contain cardinal veins
Primordial Mediastinum
Formed by 7th week - pleuropericardial membranes have fused with ventral mesenchyme
Primordial Mediastinum contains
All organs except pleura and lung
Pleuroperitoneal Membranes
Enlargement of pleuroperitoneal fold
Separates pleural from peritoneal cavities
During 6th week - membrane fuses with dorsal mesentery to make the separation
Diaphragm develops from
Septum Transversum
Pleuroperitoneal Membranes
Dorsal Mesentery of esophagus
Muscular ingrowth from lateral body walls
Diaphragm Innervation
Myoblast migrate into pleuroperitoneal membranes from 3-5 cervical myotomes carrying their nerves with them
Nerves pierce the membranes and are located on the fibrous pericardium
C3,4,5 keeps the diaphragm alive
Posterolateral Defect
Left membrane not fusing and the intestine goes in
Congenital Hiatal Hernia
Stomach going up and bulges itno chest through the opening
