Origin
Each intercostal muscle originates from 1st rib.
Insertion
Each intercostal muscle inserts into the 2nd or 3rd rib below its origin.
Blood supply
Superior intercostal artery, posterior intercostal arteries.
Nerve supply
Intercostal nerves.
Action
Subcostalis causes depression of the lower ribs. Hence this muscle is used in the process of respiration.
Muscle Exercise
Parighasana yoga stretch, back bend, and performance breathing can help in increasing the strength of the subcostalis muscles.
Interesting facts
Whenever you feel sharp, stabbing pains while breathing, you have subcostalis muscle strain.
