Set of levatores costarum longi
Musculi levatores costarum longi · Dlouhé zdvihače žeber
Muscles
Looks like
Longer muscles in the lower chest spine, running from a vertebra's side process down to the rib two levels below.
What it does
Lift the ribs slightly and help bend the spine to the side.
Keeping it well
Rarely a source of symptoms; they are part of the deep back layer powered by spinal nerve back branches.