Thorax Lecture 2 Thoracic cavity.

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1 Thorax Lecture 2 Thoracic cavity. Spring 2016 Dr. Maher Hadidi, University of Jordan 1

2 Enclosed by the thoracic wall. Extends between (thoracic inlet) & (thoracic outlet). Thoracic inlet At root of the neck. Thoracic outlet Close by the diaphragm. Thoracic cavity Spring 2016 Dr. Maher Hadidi, University of Jordan 2

3 Thoracic cavity Borders: Ant. Sternum. Post. 12 vertebrae. Lateral The curving ribs, costal cartilages. Their coverings and linings. Spring 2016 Dr. Maher Hadidi, University of Jordan 3

4 Thoracic cavity Divided into 3 major compartments: Two Peripheral pleural sacs, right and left, each enclosing a lung. One Central, Mediastinum. Spring 2016 Dr. Maher Hadidi, University of Jordan 4

5 Spring 2016 Dr. Maher Hadidi, University of Jordan 5

6 Pleura and Lungs Spring 2016 Dr. Maher Hadidi, University of Jordan 6

7 Pleura Thin continuous membrane that covers lungs and lines thoracic wall. Parts: Parietal, line wall of thoracic cavity. Parts: 1-4 Visceral, cover the lungs. Pleural cavity: Potential space between parietal and visceral pleura that contains pleural fluid for soundless & frictionless movements of the lungs. Become true in diseases. Spring 2016 Dr. Maher Hadidi, University of Jordan 7

8 Spring 2016 Dr. Maher Hadidi, University of Jordan 8

9 About 13 cm long. Extends from lower end of larynx to sternal angle. Pass within 2 regions neck and thorax. Divides into 2 1ry bronchi at sternal angle level. Trachea Spring 2016 Dr. Maher Hadidi, University of Jordan 9

10 Right 1ry bronchus Shorter Wider Vertical than left. About 1 inch long. Therefore, inhaled foreign bodies that enter trachea are commonly trapped in it. Spring 2016 Dr. Maher Hadidi, University of Jordan 10

11 Left primary bronchus Narrower Longer More horizontal. About 2 inch long. Spring 2016 Dr. Maher Hadidi, University of Jordan 11

12 Lungs Conical-shaped spongy organs. Lie on both sides of mediastinum. Attach to mediastinum by its root. Suspended free within its own pleural cavity. Spring 2016 Dr. Maher Hadidi, University of Jordan 12

13 Spring 2016 Dr. Maher Hadidi, University of Jordan 13

14 Parts, each lung has: Apex (projects up). Base (concave). 3 borders: Anterior (narrow & overlap the heart). Posterior (rounded, on both sides of the vertebral column). Inferior (narrow). 3 surfaces: Diaphragmatic (concave), rest on the diaphragm. Costal (wide and convex). Mediastinal, related to mediastinal structures. Lungs Spring 2016 Dr. Maher Hadidi, University of Jordan 14

15 Left Lung Characteristics: Has one oblique fissure. Has 2 lobes: Superior lobe. Inferior lobe. Has Cardiac notch at its anterior border, notched by the heart. Spring 2016 Dr. Maher Hadidi, University of Jordan 15

16 Left Lung Characteristics: Since it develop in a smaller space. It is: Longer Narrower Lighter Less functional than the right. Related to the high pressure arterial side of the heart. Spring 2016 Dr. Maher Hadidi, University of Jordan 16

17 Right Lung Characteristics: Has 2 fissures: Oblique. Horizontal. Has 3 lobes: Superior lobe. Middle lobe. Inferior lobe. Spring 2016 Dr. Maher Hadidi, University of Jordan 17

18 Right Lung Characteristics: Since it develop in a larger space. It is: Wider. Shorter. Heavier. More functional than the left. Related to the low pressure venous side of the heart. Spring 2016 Dr. Maher Hadidi, University of Jordan 18

19 Connect lung to the mediastinum. Surrounded by pleural sleeve. Contents: 1 Main bronchus. 1 Pulmonary artery. 2 pulmonary veins, Superior Inferior Nerves. lymphatics. Arterial supply: The lung tissue itself, supplied by bronchial arteries from thoracic aorta. Root of the Lung Spring 2016 Dr. Maher Hadidi, University of Jordan 19

20 1ry bronchi 2 lobar bronchi in the left lung and 3 in the right lung, each for a pulmonary lobe. Lobar bronchi divide repeatedly, lobular bronchioles for pulmonary lobules Terminal bronchioles. Each terminal bronchiole subdivides into respiratory bronchioles, numerous saclike alveoli where gas exchange occurs. Bronchial Tree Spring 2016 Dr. Maher Hadidi, University of Jordan 20

Lecturer: Ms DS Pillay ROOM 2P24 25 February 2013

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