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37 Cards in this Set
- Front
- Back
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How is the coelomic cavity/intra-embryonic coelom formed?
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lateral and cephalo-caudal folding of embryo
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when is the intraembryonic coelom formed?
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4th week
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what is the mesothelium
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mesoderm lining the coelomic cavity
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what are the 3 components of the mesothelium?
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1) somatic mesoderm
2) splanchnic mesoderm 3) mesenteries |
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what is the somatic mesoderm?
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parietal mesothelium lining plueral, pericardial and peritoneal cavity
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what is the splanchnic mesoderm?
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visceral layer of mesothelium that lines lungs, heart and abdominal organs
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what is the mesenteries
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two sided elongations of mesothelium lining the body wall and abdominal organs
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What is the septum transverum?
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mesoderm cranial to pericardial cavity
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What are the four components of the diaphragm?
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1) septum transversum
2) pleuroperitoneal membranes 3) dorsal mesoesophagus 4) lateral and dorsal body wall |
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How does the septum transversum assume its definitive position?
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1) septum transversum starts out on the mesoderm outside of the yolk sac (so cranial to the heart)
2) head folds under 3) septum transversum now gets moved to a point below heart and above yolk stalk |
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When does the septum transversum assume its final position?
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week 4
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What is the final thing that happens to the septum transversum
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it fuses with the mesenchyme ventral to the esophagus
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What are the three principle body cavities of the adult?
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Foregut
Midgut Hindgut |
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What is in the foregut? (mneumonic)
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PEDS
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What is in the foregut (full explanation pls)?
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Pharynx
Esophagus Duodenum, upper 1/2 Stomach |
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What is in the midgut? (menumonic)
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A CAT DJ
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What is in the midgut full explanation
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A ppendix
C Cecum A scending colon T Transverse Colon, right 2/3 D Duodenum, lower 1/2 J Jejunum |
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What is in the hindgut
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D - Descending colon
S - Sigmoid Colon R - Rectum T - Left 1/3 of transverse colon |
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What accounts for the seperation of the plueral and pericardial cavities?
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1) pleuropericardial folds form
2) pleuropericardial folds elongate towards the mdiline where they meet and fuse each other |
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How does the thoracic and abdominal wall become seperated?
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1)septum transversum fuses dorsally with the plueroperitoneal membranes
2)pleuroperitoneal membranes fuse with the dorsal mesentery of the esophagus to close off pleuroperitoneal canals |
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What are the various parts of the embryonic diaphragm form in the adult?
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1) septum transversum becomes central tendon
2) dorsal mesoesophagus becomes the crural of the diapram 3)lateral and dorsal body wall becomes the peripheral muscle of the adult diapraghm |
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How does the primitive gut tube form?
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during cephalocaudal and lateral folding of embryo part of endoderm lined cavity is taken up into embryo to form primitive gut
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What is the foregut of the embryo?
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cephalic tube from buccopharyngeal membrane to anterior intestinal portal (end of foregut, start of midgut)
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What is the midgut?
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central region of primitive gut opens into the yolk sac via vitiline duct/yolk stalk
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What is the hind gut?
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posterior intestinal portal (end of midgut, beginning of hind gut)
to cloacal membrane |
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What is the relationship between the primitive gut tube and the primitive mesenteries?
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the primitive gut is inside of the visceral peritoneaum
outside of that is the dorsal mesentery which is what holds the gut to the body wall |
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what is inside the peritoneal cavity
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nothing but a small amount of fliud
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what are the intraperitoneal organs?
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organs suspended within the peritoneal cavity by a mesentery
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What are retroperitoneal organs?
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organs embedded in body wall and covered by peritoneum
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What is secondary retroperitoneal organs?
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Mesentery suspends some intraperitoneal organs but disspears and mesentery and organ fuses into body wall
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when does the lung begin to develop?
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day 22
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What eventually happens to the chorionic cavity?
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it gets obliterated as the amniotic cavity expands
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what is the function of the dorsal and ventral mesentery
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dorsal suspends the primtive gut from the body wall in most places and ventral suspends it in some places
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when does the folding of the embryo complete
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week 4
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when does the thoracic cavity begin to seperate into 3
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week 5
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when does the amnion close the yolk sac and make it into an umbilical cord
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week 7
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when does the diapragm finally seperate
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week 16 is when the canals close
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