Class notes
Intercostal structures
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Lecture notes of 9 pages for the course Medicine at QUB (Respiratory anatomy)
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INTERCOSTAL STRUCTURESBreathing in Cquiet inspiration
Diaphragm contracts dome lowers
External intercostal muscles Raise ribs
Thoracic volume 4 Air sucked into lungs
Intra pleural pressure
Breathing out quiet 1passiveexpiration
Diaphragm relaxes dome rises due to decompression of
Abdo organs
No muscles involved
Thoracic volume recoil Air out
Intra pleural pressure 9
my lungs
Rib movements
A Bucket handle action B Pump handle action T
T transverse dimension Anteroposterior dimension
lower
Mainly Mainly upper
, Intercostal muscles
A External intercostal muscles 4
Run in Fero
anteriorly from rib above to rib
below
They elevate ribs duringinspiration
NB muscle is not presentanteriorly
A
replaced by external intercostal membrane
B B Internal intercostals B Run
in fero
posteriorly from rib above to rib
below
deep and perpendicular to externals
Interosseus parts depress ribs in expiration
I N N E R V A TI O N INTERCOSTAL NERVES
Intercostal muscles stiffen the intercostal space so it
doesn't inward outward
during breathing additionally
bulge
aid in posture coughing t vomiting
Deeper muscles Trans versus thoracies
Innermost intercostals f Runs from posterior
Same as internal muscles aspectof sternum to
DO
iii Run from
rib above to 213 below
only posteriorly
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