Chapter 33: Fetal Echocardiography: Beyond the Four Chambers

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1

atrioventricular node

area of specialized cardiac muscle that receives the cardiac impulse from the sinoatrial node and conducts it to the atrioventricular bundles

2

bicuspid aortic valve

two leaflets instead of the normal three leaflets with asymmetric cusps

3

bulbus cordis

primitive chamber that forms the right ventricle

4

ductus arteriosus

communication between the pulmonary artery and descending aorta that closes after birth

5

foramen ovale

also termed fossa ovale; opening between the free edge of the septum secundum and the dorsal wall of the atrium

6

inferior vena cava

venous return into the right atrium of the heart along the posterior lateral wall

7

left atrium

filling chamber of the heart

8

left ventricle

pumping chamber of the heart

9

main pulmonary artery

main artery that carries blood from the right ventricle to the lungs

10

mitral valve

atrioventricular valve between the left atrium and left ventricle

11

patent ductus arteriosus

open communication between the pulmonary artery and descending aorta that does not constrict after birth

12

pulmonary veins

four pulmonary veins bring blood from the lungs back into the posterior wall of the left atrium; there are two upper (right and left) and two lower (right and left) pulmonary veins

13

right atrium

filling chamber of the heart

14

right ventricle

pumping chamber of the heart that sends blood into the pulmonary artery

15

septum primum

first part of the atrial septum to grow from the dorsal wall of the primitive atrium; fuses with the endocardial cushions

16

septum secundum

grows into the atrium to the right of the septum primum

17

sinoatrial node

forms in the wall of the sinus venosus near its opening into the right atrium

18

superior vena cava

vessel receiving venous return from the head and upper extremities into the upper posterior medial wall of the right atrium

19

tricuspid valve

atrioventricular valve found between the right atrium and right ventricle