Muscles of Respiration Flashcards
What are the muscles called that are found inbetween the ribs? how many layers and what are they called?
Intercostals
3
External, internal, innermost
what actions are the external intercostals verses the internal/ inner most intercostals?
External action = quiet and forced inspiration ( through elevation of ribs)
internal/ innermost = forced expiration
Which of the intercostal muscles are responsible for quiet and forced inspiration?
External intercostals
Which of the intercostal muscles are responsible for forced expiration
internal/ innermost
Levator costarum attaches from where to where and is responsible for what action?
TVPs of C7-T11 to the immediate rib under
elevates the ribs (helps you breath in)
Which muscle is considered the principle muscle of respiration?
the diaphragm
The top of the diaphramic dome sits at approx where during inspiration and expiration?
4th intercostal space (during expiration) and 6 th intercostal space (during inspiration)
The diaphragm has 2 components that are label what?
The muscle component
the tendonis compnent
The muscle portion of the diaphragm attaches where?
post surface of xiphoid
internal surface of lower 6 ribs
upper lumbar vertebrae
travels over QL and Psoas
How does inspiration work?
Contraction of the diaphragm cause inf movement of the central tendon
as it flattens it increases the vertical dimension of the thoracic cavity.
Ribs move in bucket handle movement to increase thoracic volume as well.
Pump handle movement of the sternum also increases thoracic volume.
This increases the dimensions of the thoracic cage and creates negative pressure in the lungs which results in are being drawn in
What happens during expiration?
The diaphragm relaxes and moves superiorly, this with the elastic recoil of the lungs decrease the thoracic volume and increase the thoracic pressure, air flows out ( normally this is a passive process)
