Respiratory 5 Flashcards
What are the muscles of Inspiration?
- Sternocleidomastoid
- Scalenes
- External intercostals
- Parasternal intercostals
- Diaphragm
What are the muscles of Expiration?
- Internal intercostals
- External abdominal oblique
- Internal abdominal oblique
- Transversus abdominis
- Rectus abdominis
What are the two accessory inspiration muscles?
The sternocleidomastoid and the Scalenes
Which inspiratory muscles lie between the ribs?
The external intercostals
Where do the Parasternal intercostal muscles lie?
In between the ribs but close to the sternum
What separate the abdominal and thoracic cavities?
The diaphragm
Where are the Internal intercostals located?
Between the ribs
What are the four classes of muscles that constitute the abdominal muscles?
- Diaphragm
- External abdominal oblique
- Transversus abdominis
- Rectus abdominis
How are abdominal content and the ribcage affected when the diaphragm contracts?
Abdominal content is pushed down and the ribcage is pushed outward and widened
What is the overall effect of the diaphragm contracting?
An increase in the thoracic volume
What happens when the external intercostals (inspiratory pump) muscles contract?
They lift the rib cage causing a lateral increase in the thoracic volume
How do the External intercostals work?
They contract and pull the ribs upward increasing the lateral volume of the thorax
What is the bucket handle movement used to describe?
The motion of the External intercostal muscles
What kind of increase in volume do the Parasternal intercostals promote?
An anterior increase in volume
What is the Pump handle motion used to describe?
The anterior increase in volume associated with the Parasternal intercostal muscles
