parietal pleura
Summary
The parietal pleura is the outer layer of the pleural membrane that lines the inner chest wall, diaphragm, and mediastinum. It is innervated by somatic nerves (intercostal and phrenic) making it sensitive to pain, unlike the visceral pleura. Inflammation causes sharp, localized chest pain that worsens with breathing.
Detail
The parietal pleura is the outer layer of the double-layered serous membrane surrounding the lungs, continuous with but distinct from the visceral pleura that covers the lung surface. It consists of four anatomical divisions: costal pleura (lines ribs and intercostal spaces), diaphragmatic pleura (covers diaphragm), mediastinal pleura (covers mediastinal structures), and cervical/cupola pleura (extends above the first rib). The parietal pleura receives sensory innervation from the intercostal nerves (costal portion) and phrenic nerve (diaphragmatic and mediastinal portions), making it exquisitely pain-sensitive. This contrasts with the visceral pleura, which lacks pain fibers. The pleural space between parietal and visceral layers normally contains 10-20mL of pleural fluid for lubrication. Pathologically, parietal pleural inflammation (pleuritis) causes characteristic sharp, stabbing chest pain that increases with inspiration, coughing, or movement. Common conditions affecting the parietal pleura include pneumothorax, pleural effusion, empyema, and malignant pleural disease. Understanding parietal pleural anatomy is crucial for procedures like thoracentesis and chest tube placement.
Sources
- Gray's Anatomy
- Netter's Atlas of Human Anatomy
- Harrison's Principles of Internal Medicine
- Costanzo Physiology
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