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35 Cards in this Set
- Front
- Back
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3 Subdivisions of the General Body Cavity:
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1. Pleural cavity
2. Pericardial cavity 3. Peritoneal cavity |
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Formation of What 2 Structures separates the general intraembryonic coelom into 3 subdivisions?
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1. Pericardial membrane
2. Diaphragm |
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Human embryos start out as:
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Trilaminar plate
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Trilaminar plate consists of:
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-Ectodermm
-Mesoderm -Endoderm |
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How does the cylindrical form of the embryo develop?
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Lateral edges of trilaminar plate extend ventrally and meet medially.
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What results from the ventral fusion of the lateral plates?
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The Intraembryonic coelom.
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What is the intraembryonic coelom?
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One long continuous closed space that contains a piece of primitive gut.
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What is the Primitive Gut piece in the intraembryonic coelom made of?
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Endoderm squeezed off of yolk sac during folding/fusion to form the gut tube.
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What is attached to this Primitive Gut piece?
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Dorsal and Ventral mesentary
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What embryonic tissue are the mesentarys derived from?
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Mesoderm
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What does Ectoderm contribute to the developing Thorax?
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-Neurons to innervate thoracic structures
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What does Mesoderm contribute to the developing Thorax?
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-Splanchnic mesoderm
-Somatic mesoderm |
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What does Splanchnic mesoderm give rie to?
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Linings of visceral organs
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What does Somatic mesoderm give rise to?
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It adheres to the body wall structures.
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What does Endoderm contribute to the developing Thorax?
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Functional alveolar cells of the lungs which are in contact with the air.
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Of the layers lining the thoracic wall, what gives the:
-Parietal layer -Visceral layer |
Parietal = Somatic mesoderm
Visceral = Splanchnic mesoderm |
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What does the pericardium develop from?
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Pleuropericardial membrane
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What does the diaphragm develop from?
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-Septum transversus
-Pleuroperitoneal membrane -Dorsal mesentary of esophagus -Body wall |
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What tissue is Septum Transversum derived from?
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mesoderm
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What part of the diaphragm is formed by Septum Transversum?
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Anterior part and Central tendon
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What causes a congenital diaphragmatic hernia (CDH)?
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Failure of the pleuroperitoneal membrane to properly form/fuse.
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On what side does a CDH usually occur?
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Left - b/c liver on the right side prevents herniation there.
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What part of the diaphragm develops from the Dorsal Mesentary of the Esophagus?
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Posterior/central portion
-Crura in the adult body |
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What is most of the diaphragm in the newborn made up of?
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Body wall musculature
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What is the earliest step in lung tissue formation?
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Formation of the Laryngotracheal groove
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Where does the Laryngotracheal groove develop?
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Between the 4th Branchial Arches at the midline.
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From what embryonic tissue is Laryngotracheal groove derived?
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Endoderm
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What is the next step in lung formation?
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A Diverticulum develops from the laryngotracheal groove.
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By what arches does the laryngotracheal groove develop?
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4th
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what results from failure of the laryngotracheal groove to develop properly?
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Tracheoesophageal fistula
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What does the primary division of lungs result in?
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Main stem bronchi
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What does secondary division result in?
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Lobes of bronchi
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What does tertiary division result in?
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Bronchopulmonary segments
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What is Congenital Diaphragmatic herniation most commonly associated with?
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Hypoplastic left lung - the herniated intestines press on the developing lung.
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What is associated with abnormal devo of the dorsal mesentary of the esophagus?
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Hiatal hernia - because its sphincter like action is impaired.
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