Muscles Of Respiration 1 Flashcards
What type of muscles are involved in ventilation?
Skeletal muscles, their structure and function are identical to those of other skeletal muscles.
What is the diaphragm?
A thin, musculotendinous, dome-shaped sheet of muscle that separates the thorax from the abdomen.
Where is the diaphragm attached?
The lower ribs
What nerves innervate the diaphragm?
The right and left phrenic nerves, which have their origins at C3-C5.
What is the highest point of the diaphragm and where is it attached to the body wall?
It’s highest point is level with T9, it’s attached to the body wall level with T12.
Where does the blood supply to the diaphragm originate? And where is the blood drained to?
It originates from the intercostal arteries. It drains to the inferior vena cava.
What are the 3 major structures that travel through the diaphragm?
The inferior vena cava.
Aorta
Oesophagus.
What happens to the diaphragm when it contracts? And what happens to the ribs as a result?
It flattens, which increases the volume of the thorax and aids inspiration.
The rib margins are lifted and moved out, which increases the transverse diameter of the thorax.
During quiet breathing how much does the apex of the diaphragm move?
1-2cm inferiorly
During deep breathing how much can the diaphragm move?
10cm inferiorly.
