As the diaphragm relaxes, it moves upward due to its elasticity. These movements decrease the volume of the thoracic cavity, which decreases lung volume. What happens when the diaphragm relaxes Class 7? When the diaphragm contracts, oxygen rich air is pulled inside the lungs. Exchange of gases takes place inRead More →
The right crus of the diaphragm loops around forming a sling around the esophagus. Upon inspiration, this sling would constrict the esophagus, forming a functional (not anatomical) sphincter that prevents stomach contents from refluxing up the esophagus when intra-abdominal pressure rises during inspiration. What are the left and right crus?Read More →
Phrenic nerve stimulation, also known as diaphragm pacing, is the electrical stimulation of the phrenic nerve using a surgically implanted device. This device contracts the diaphragm rhythmically, improving breathing function in patients with respiratory insufficiency. Why is the phrenic nerve important? The phrenic nerve is a mixed motor/sensory nerve whichRead More →
In patients with more advanced asthma, varying stages of hyperinflation are reflected on chest radiographs by a flattening of the hemidiaphragm, increased retrosternal airspace, and relatively minor differences in diaphragmatic positions between inspiration and expiration. What does a flattened diaphragm feel like? Symptoms of significant, usually bilateral diaphragm weakness orRead More →