Septation of the chamber 262-263 Flashcards

1
Q

Septum primum

A

Grows toward endocardial cushions, narrowing foramen primum

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2
Q

foramen secundum

A

forms in septum primum(foramen primum disappears)

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3
Q

Septum secundum

A

develops as foramen secundum maintains right-to-left shunt

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4
Q

septum secundum

A

expands and covers most of the foramen secundum. the residual foramen is the foramen ovale

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5
Q

What forms foramen ovale.

A

Remaining portion of septum primum

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6
Q

what forms the atrial septum

A

septum secundum and septum primum

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7
Q

what causes the foramen ovale to close soon after birth

A

the increase pressue in the LA

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8
Q

patent foramen ovale

A

caused by failure of septum primum and septum secundum to fuse after birth; most are left untreated, and can lead to paradoxical emboli( venous thromboemboli that enters systemic arterial circulation), similar to those resulting from an ASD

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9
Q

what forms interventricular foramen

A

muscular interventricular septum

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10
Q

What forms membranous interventricular septum

A

aorticopulmonary septum rotates and fuses with muscular ventricular septum

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11
Q

VSD

A

most common congenital cardiac anomaly, usually occurs in membranous septum.

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12
Q

what contributes to atrial spetation and membranous portion of the interventricular septum

A

Growth of endocardial cushions separates from atria from ventricles

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13
Q

conotruncal abnormalities associated with failure of neural crest cells to migrate.

A

Transposition of great vessels.
Tetralogy of fallot
persistent truncus arteriosus

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14
Q

what forms the aorticopulmonary septum

A

Truncal and bulbar ridges that spiral and fuse.

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15
Q

Aortic/pulmonary

A

derived from endocardial cushions of outflow tract

Valvular anomalities may be stenotic, regurgitant, atretic(e.g tricuspid atresia), or displaced(e.g Ebstein anomaly)

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16
Q

Mitral/Tricuspid

A

derived from fused endocardial cushions of the AV canal

Valvular anomalities may be stenotic, regurgitant, atretic(e.g tricuspid atresia), or displaced(e.g Ebstein anomaly)