10 Questions
The diaphragm pulls down its central tendon and increases the vertical diameter of the thorax
action
The diaphragm is the most important ______ used in inspiration
muscle
The contraction of the diaphragm assists the contraction of the muscles of the anterior abdominal wall in raising the intra-abdominal pressure for micturition, defecation, and parturition
abdominal straining
The diaphragm assists the muscles of the anterior abdominal wall in raising the intra-abdominal pressure to such an extent that it helps support the vertebral column and prevent flexion
weight-lifting muscle
The descent of the diaphragm decreases the intrathoracic pressure and at the same time increases the intra-abdominal pressure
Thoracoabdominal pump
The diaphragm has three main ______
openings
The aortic opening transmits the ______
aorta, the thoracic duct, and the azygos vein
The esophageal opening transmits the ______
esophagus, the right and left vagus nerves, the esophageal branches of the left gastric vessels, and the lymphatics from the lower third of the esophagus
The caval opening transmits at the level of the 8th thoracic vertebra in the central tendon
the esophagus, the right and left vagus nerves, the esophageal branches of the left gastric vessels, and the lymphatics from the lower third of the esophagus
The mediastinum extends anteriorly to the ______
sternum and posteriorly to the vertebral column
Study Notes
Diaphragm Function
- During inspiration, the diaphragm pulls down its central tendon and increases the vertical diameter of the thorax.
- The diaphragm is the most important muscle used in inspiration.
Association with Other Muscles
- The contraction of the diaphragm assists the contraction of the muscles of the anterior abdominal wall in raising the intra-abdominal pressure for various activities such as micturition, defecation, and parturition.
- The diaphragm also helps support the vertebral column and prevent flexion by assisting the muscles of the anterior abdominal wall in raising the intra-abdominal pressure.
Pressure Changes
- The descent of the diaphragm decreases the intrathoracic pressure and increases the intra-abdominal pressure.
Diaphragm Structure
- The diaphragm has three main openings.
Openings and Transmissions
- The aortic opening transmits the aorta.
- The esophageal opening transmits the esophagus.
- The caval opening transmits the inferior vena cava at the level of the 8th thoracic vertebra in the central tendon.
Mediastinum Extension
- The mediastinum extends anteriorly to the sternum.
Test your knowledge of the action and functions of the diaphragm in the human body with this anatomy quiz. Explore how the diaphragm contributes to inspiration and abdominal straining.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
