Muscles Of Thoracic Wall

Question 0

Internal Intercostal

Answer 0

Origin: Inferior border of ribs
Ins: Superior border of ribs
Inv: Intercoastal Nerve
Action: during forced inspiration....
Interosseous part depresses ribs
Interchondral part elevates ribs

Question 1

External Intercostal

Answer 1

Origin: Inferior border of ribs
Ins: Suoerior border of ribs
Inv: Intercostal nerve
Action: elevates ribs during forced inspiration

Question 2

Innermost Intercostal

Answer 2

Origin: Inferior border of ribs
Ins: Superior border of ribs
Inv: Intercostal nerve
Action: weakly depresses ribs

Question 3

Subcostal

Answer 3

Origin: Internal surface of lower ribs near angles
Ins: Superior border of 2nd or 3rd ribs below
Inv: Intercostal Nerve
Action: during forced inspiration….
Interosseous part depresses ribs
Interchondral part elevates ribs