Fissures & Lobes Of Lungs

Fissures & Lobes Of Lungs


FISSURES & LOBES OF LUNGS

FISSURES

  • The oblique fissure (in both right & left lungs) cuts into the whole thickness of the lung, except at the hilum.
  • It passes obliquely downward & forwards, crossing the posterior border of lung about 6 cm below the apex & the inferior border of lung about 5 cm from the median plane.
  • In the right lung, horizontal fissures passes from the anterior border of lung to the oblique fissure & sepaeates a wedge-shaped middle lobe from the upper border.
  • The fissure runs horizontally at the level of 4th costal cartilage & meets the oblique fissure in the midaxillary line.
  • The tongue-shaped projection of the lung below the cardiac notch is called lingula.
  • It corresponds to the middle lobe of the right lung.

Surface marking of fissures

OBLIQUE FISSURE can be drawn by joining:

  1. A point 8 cm lateral to 3rd thoracic vertebra.
  2. Another point on the 5th rib in mid axillary line.
  3. A third point on the 6th costal cartilage 7.5 cm from the median plane.

HORIZONTAL FISSURES is represented by a line joining:

  1. A point on the anterior border of the right lung at the level of the fourth costal cartilage.
  2. A second point on the fifth rib in the midaxillary line.

 LOBES OF LUNGS

  • The right lung is divided into 3 lobes (upper, middle & lower) by two fissures, oblique & horizontal.
  • The left lung is divided into two lobes (upper & lower) by the oblique fissures.
  • Each lobe is further subdivided into bronchopulmonary segments.
  • Each lung has 10 bronchopulmonary segments.

RIGHT LUNG

UPPER LOBE

MIDDLE LOBE

LOWER LOBE

1. Apical

4. Lateral

6. Superior

2. Posterior

5. Medial

7. Anterior basal

3. Anterior

 

8. Medial basal

 

 

9. Lateral basal

 

 

10. Posterior basal

LEFT LUNG

UPPER LOBE

LOWER LOBE

1. Apical

6. Superior

2. Posterior

7. Anterior basal

3. Anterior

8. Medial basal

4.Superiorlingular

9. Lateral basal

5. Inferior lingular

10. Posterior basal

Exam Question

  • Bulging fissures in lungs is seen in Klebsiella pneumonia.
  • Each lung has 10 bronchopulmonary segments.
  • Right lung is divided into 3 lobes (upper, middle & lower) by two fissures, oblique & horizontal.
  • The left lung is divided into two lobes (upper & lower) by the oblique fissures.
Don’t Forget to Solve all the previous Year Question asked on Fissures & Lobes Of Lungs

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