The fissures of the lungs are deep grooves that divide each lung into lobes.
Lung Fissure Overview
The lungs are not single, undivided masses. Instead, they are composed of sections called lobes, separated by fissures. These fissures are essential anatomical landmarks. They play a crucial role in allowing the lungs to expand and contract efficiently during respiration.
Fissures of the Left Lung
The left lung has a single fissure:
- Oblique (Major) Fissure: This fissure separates the left lung into two lobes—the upper and the lower lobe.
Fissures of the Right Lung
The right lung has two fissures:
- Oblique Fissure: Similar to the left lung, the right lung has an oblique fissure.
- Horizontal Fissure: This unique fissure, only found in the right lung, separates the upper and middle lobes.
Summary of Fissures and Lobes
| Lung | Fissures | Lobes |
|---|---|---|
| Left | Oblique (Major) Fissure | Upper, Lower |
| Right | Oblique Fissure, Horizontal Fissure | Upper, Middle, Lower |
Practical Insights
- Visceral Pleura: Each lobe, created by these fissures, has its own visceral pleural covering. This membrane helps reduce friction during breathing.
- Respiratory Efficiency: The fissures contribute to the lungs' flexibility. They enable each lobe to expand and contract independently to some degree, optimizing respiratory function.
In essence, the fissures are not just lines on the lung surface; they are key anatomical features that determine the structure and functionality of the lungs.
