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12 Cards in this Set
- Front
- Back
From which layer does the cardiovascular system develop?
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Mesoderm; yolk sac plus splanchopleuric mesoderm
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Early step in heart development is the fusion of a pair of tubes; the tubes are initially on the right and left sides of early embyro, folding brings them together in the midline
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Splanchopleuric mesoderm
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Mesoderm that touches an organ (medial red lines)
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Pericardial Cavity formation; bronchial buds expand, common cardinal veins merge in the midline to form inferior vena cava
Note that the phrenic nerve runs laterally on the pericardium |
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Pericardial Cavity formation; bronchial buds expand, common cardinal veins merge in the midline to form inferior vena cava
Note that the phrenic nerve runs laterally on the pericardium |
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Dextral looping; in the primitive heart tube blood flows through the left ventricle prior to the right ventricle; dextral looping corrects this and properly aligns the chambers
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Where do the atrioventircular valves develop?
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On endocardial cushions w/ attachments to chordae tendinae and papillary muscles
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What cells make up the truncoconal septum
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Forms from neural crest cells that migrate into the wals of the outflow tract; it must spiral/fuse to ensure that the pulmonary trunk connects to the right ventricle and the aorta connects to the left ventricle
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Persistent Truncus
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Truncoconal septum does not form
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Ventricular Septal Defect
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Membranous interventricular septum (from the truncoconal septum) fails to fuse to the muscular interventricular septum
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Transposition of Vessels
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Occurs if truncoconal septum fails to spiral
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Tetralogy of Fallot; septum forms off center towards the right
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