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35 Cards in this Set

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3 Subdivisions of the General Body Cavity:
1. Pleural cavity
2. Pericardial cavity
3. Peritoneal cavity
Formation of What 2 Structures separates the general intraembryonic coelom into 3 subdivisions?
1. Pericardial membrane
2. Diaphragm
Human embryos start out as:
Trilaminar plate
Trilaminar plate consists of:
-Ectodermm
-Mesoderm
-Endoderm
How does the cylindrical form of the embryo develop?
Lateral edges of trilaminar plate extend ventrally and meet medially.
What results from the ventral fusion of the lateral plates?
The Intraembryonic coelom.
What is the intraembryonic coelom?
One long continuous closed space that contains a piece of primitive gut.
What is the Primitive Gut piece in the intraembryonic coelom made of?
Endoderm squeezed off of yolk sac during folding/fusion to form the gut tube.
What is attached to this Primitive Gut piece?
Dorsal and Ventral mesentary
What embryonic tissue are the mesentarys derived from?
Mesoderm
What does Ectoderm contribute to the developing Thorax?
-Neurons to innervate thoracic structures
What does Mesoderm contribute to the developing Thorax?
-Splanchnic mesoderm
-Somatic mesoderm
What does Splanchnic mesoderm give rie to?
Linings of visceral organs
What does Somatic mesoderm give rise to?
It adheres to the body wall structures.
What does Endoderm contribute to the developing Thorax?
Functional alveolar cells of the lungs which are in contact with the air.
Of the layers lining the thoracic wall, what gives the:
-Parietal layer
-Visceral layer
Parietal = Somatic mesoderm

Visceral = Splanchnic mesoderm
What does the pericardium develop from?
Pleuropericardial membrane
What does the diaphragm develop from?
-Septum transversus
-Pleuroperitoneal membrane
-Dorsal mesentary of esophagus
-Body wall
What tissue is Septum Transversum derived from?
mesoderm
What part of the diaphragm is formed by Septum Transversum?
Anterior part and Central tendon
What causes a congenital diaphragmatic hernia (CDH)?
Failure of the pleuroperitoneal membrane to properly form/fuse.
On what side does a CDH usually occur?
Left - b/c liver on the right side prevents herniation there.
What part of the diaphragm develops from the Dorsal Mesentary of the Esophagus?
Posterior/central portion
-Crura in the adult body
What is most of the diaphragm in the newborn made up of?
Body wall musculature
What is the earliest step in lung tissue formation?
Formation of the Laryngotracheal groove
Where does the Laryngotracheal groove develop?
Between the 4th Branchial Arches at the midline.
From what embryonic tissue is Laryngotracheal groove derived?
Endoderm
What is the next step in lung formation?
A Diverticulum develops from the laryngotracheal groove.
By what arches does the laryngotracheal groove develop?
4th
what results from failure of the laryngotracheal groove to develop properly?
Tracheoesophageal fistula
What does the primary division of lungs result in?
Main stem bronchi
What does secondary division result in?
Lobes of bronchi
What does tertiary division result in?
Bronchopulmonary segments
What is Congenital Diaphragmatic herniation most commonly associated with?
Hypoplastic left lung - the herniated intestines press on the developing lung.
What is associated with abnormal devo of the dorsal mesentary of the esophagus?
Hiatal hernia - because its sphincter like action is impaired.