subcostalis
noun
sub·cos·ta·lis
| \ ˌsəb-käs-ˈtā-ləs
\
\
plural subcostales\ -ˌlēz
\
\
Medical Definition of subcostalis
: any of a variable number of small muscles that arise on the inner surface of a rib, are inserted into the inner surface of the second or third rib below, and probably function to draw adjacent ribs together