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23 Cards in this Set
- Front
- Back
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When does the spaces within the mesoderm coalesce to from the intraembryonic coelom?
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The beginning of the 3rd week
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When are the major body cavities formed?
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by the end of the 8th week
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What are the 3 major cavities?
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pericardial, thoracic, and abdominopelvic
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What are the benefits of lateral folding
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1. interalize intraembryonic coelom
2. establish ventral and dorsal mesenteries 3. bring together sides of cavities to fuse |
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What are the benefits of longitudinal folding?
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reposition organs and reposition structures associtated with the body cavity
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What are the ventral and dorsal mesenteries made out of? Which one disappears?
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Made out of double layers of splanchnic mesoderm - the ventral mesentery disappears to allow communication for the intestines
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Where can you find the dorsal mesentery in an adult?
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The greater omentum and the mesentery proper of teh jejunum and ileum
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What does the dorsal mesentery provide?
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Provides a route for blood vessels, nerves, and lymphatics to reach the gut from the posterior wall
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What does the ventral mesentery create when it regresses?
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The peritoneal cavity
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Where can you find the ventral mesentery in an adult?
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the lesser omentum and the falciform ligament
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How does longitudinal folding move the septum transversum?
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from position between cranial region of embryonic disk and cardiogenic area --- to position between cardiogenic area and yolk sac
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What does the septum transversum form after folding is completed?
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a incomplete partition between the pericardial and peritoneal cavities
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Why does the septum transversum form an incomplete partition?
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Because of the openings on each side of the esophagus
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What 2 partitions does the intraembryonic coelom develop?
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the pleuropericardial folds and the pleuroperitoneal folds
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What body cavities does the intraembryonic coelom develop into:?
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Pericardial cavities, 2 pleural cavities, peritoneal cavity
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What are pleuropericardial folds made out of?
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Sheets of somatic mesoderm separating pericardial and pleural cavities
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What does the pleuropericardial folds form?
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forms fibrous pericardium surrounding heart
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What assists in the formation of the pleuropericardial folds?
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aided by the developing lungs and tension on the common cardinal veins due to longitudinal folding of the embryo
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Name the layers of the heart from superficial to deep.
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1. Fibrous pericardium
2. Parietal layer of pericardium 3. Pericardial cavity 4. Visceral layer of pericardium |
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What layer does the phrenic nerve run through?
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the fibrous pericardium
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What are the pleuroperitoneal folds?
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Sheets of somatic mesoderm from the dorsolateral body wall that separate the pleuroal and peritoneal cavity
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What embryonic structure forms the central tendon, crura, and muscle around the central tendon?
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Septum transversum --central tendon
dorsal mesentery of esophagus-- crura Body wall myoblasts -- muscle around central tendon |
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During what week does the phrenic nerve innervate the diaphragm?
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During the 4th week
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