anatomy of lungs nursing very short single single oints
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Here is a concise, point-by-point summary of lung anatomy for nursing:
🫁 Anatomy of the Lungs - Short Points (Nursing)
General
- Two lungs lie on either side of the mediastinum inside the thoracic cavity
- Surrounded by pleural cavities (right and left)
- Right lung is slightly larger than the left (heart bulges more to the left)
- Each lung has a half-cone shape
Parts of Each Lung
- Base - sits on the diaphragm
- Apex - projects above rib I into the root of the neck
- Costal surface - lies against the ribs and intercostal spaces
- Medial (mediastinal) surface - faces the mediastinum; contains the hilum
- Hilum - comma-shaped region where structures enter/leave the lung
Borders
- Inferior border - sharp; separates base from costal surface
- Anterior & posterior borders - separate costal surface from medial surface
- Posterior border is smooth and rounded (unlike the sharp anterior/inferior borders)
Lobes & Fissures
| Right Lung | Left Lung | |
|---|---|---|
| Lobes | 3 (upper, middle, lower) | 2 (upper, lower) |
| Fissures | 2 (oblique + horizontal) | 1 (oblique only) |
- Oblique fissure (right) - separates lower lobe from upper + middle lobes
- Horizontal fissure (right) - separates upper lobe from middle lobe
- Oblique fissure (left) - slightly more oblique than right side
Special Feature - Left Lung
- Has a cardiac notch (indented by heart)
- Has a lingula - tongue-like extension of upper lobe that projects over the heart
Blood Supply
- Pulmonary arteries - carry deoxygenated blood from right ventricle to lungs
- Pulmonary veins - carry oxygenated blood from lungs to left atrium
- At the hilum: pulmonary artery is superior, pulmonary veins are inferior, bronchi are posterior
Bronchial Tree
- Trachea → Right & Left main bronchi → Lobar bronchi → Segmental bronchi
- Right lung: 10 bronchopulmonary segments
- Left lung: 8 bronchopulmonary segments
- Each segment has its own artery, vein, and bronchus (can be surgically resected independently)
Structures at the Hilum (root of lung)
- Pulmonary artery
- Two pulmonary veins
- Main bronchus
- Bronchial vessels
- Nerves
- Lymphatics
Relations of Right Lung (medial surface)
- Heart, inferior vena cava, superior vena cava, azygos vein, esophagus
Relations of Left Lung (medial surface)
- Heart, aortic arch, thoracic aorta, esophagus
Nerve Supply
- Vagus nerves pass posterior to lung roots
- Phrenic nerves pass anterior to lung roots
- Pulmonary plexus forms at the hilum
Pleura
- Visceral pleura - covers the lung surface
- Parietal pleura - lines the thoracic wall
- Pleural fluid between the two layers reduces friction during breathing
Source: Gray's Anatomy for Students; Fishman's Pulmonary Diseases and Disorders
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