6 Horizontal Sections through the Thorax

Horizontal section through the thorax at level 1 (from below).

Horizontal section through the thorax at level 1 (from below). (MRI scan,

courtesy of Prof. W. Bautz and R. Janka, M. D., University of Erlangen, Germany.)

1 Internal thoracic artery and vein

2 Right atrium

3 Lung

4 Pulmonary artery

5 Pulmonary vein

6 Primary bronchus

7 Esophagus

8 Serratus anterior muscle

9 Scapula

10 Longissimus thoracis muscle

11 Sternum

12 Pectoralis major and minor muscles

13 Conus arteriosus (right ventricle),

pulmonic valve

14 Ascending aorta and left coronary artery

(only in upper figure)

15 Left atrium

16 Descending aorta

17 Thoracic vertebra

18 Spinal cord

19 Latissimus dorsi muscle

20 Trapezius muscle


Horizontal Sections through the Thorax 287

Horizontal section through the thorax at level 2 (from below).

Horizontal section through the thorax at level 2 (from below). (MRI scan,

courtesy of Prof. W. Bautz and R. Janka, M. D., University of Erlangen, Germany.)

Levels of sections.

21 Right ventricle

22 Right coronary artery

23 Right atrioventricular valve

24 Lung (upper lobe)

25 Left atrium

26 Pulmonary veins

27 Lung (lower lobe)

28 Erector muscle of spine

29 Third costal cartilage

30 Nipple

31 Left ventricle

32 Pericardium

33 Left atrioventricular valve

34 Left coronary artery and coronary sinus

35 Accessory hemiazygos vein

36 Serratus anterior muscle

37 Pulmonary trunk


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Fetal Circulatory System

Heart and right lung of the fetus (viewed from left side). The left lung has

been removed. Note the ductus arteriosus (Botalli).

Heart of the fetus (anterior aspect).

Right atrium and ventricle opened.

1 Right common carotid artery

2 Right brachiocephalic vein

3 Left brachiocephalic vein

4 Superior vena cava

5 Ascending aorta

6 Right auricle

7 Pulmonary trunk

8 Left primary bronchus

9 Left auricle

10 Right ventricle

11 Left ventricle

12 Left common carotid artery

13 Trachea

14 Superior lobe of right lung

15 Left subclavian artery

16 Aortic arch

17 Ductus arteriosus (Botalli)

18 Inferior lobe of right lung

19 Left pulmonary artery with branches to the

left lung

20 Descending aorta

21 Left pulmonary veins

22 Inferior vena cava

23 Foramen ovale

24 Right atrium

25 Opening of inferior vena cava

26 Valve of inferior vena cava

(Eustachian valve)

27 Opening of coronary sinus

28 Anterior papillary muscle of right ventricle

Shunts in the fetal circulation system

1. Ductus venosus between umbilical vein bypass of liver

(of Arantius) and inferior vena cava circulation

2. Foramen ovale between right and left bypass of pulmonary

atrium circulation

3. Ductus arteriosus between pulmonary trunk

(Botalli) and aorta

Heart of the fetus (schematic drawing).

Direction of blood flow indicated by

arrows. Note the change in oxygenation

of blood after ductus arteriosus entry into

aorta.

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