SECOND ORDER

external intercostal muscle function

elevate the ribs

internal intercostal muscle function

depress the ribs

innermost intercostal muscle function

depress the ribs

external oblique function

UNI: lat flex of vert col. rotation of vert. col. to opposite side

BI: flexes vert. col. and compresses abdominal wall, used in forced exhalation

internal oblique muscle

UNI: lat flex of vert col, rotation of vert col to same side

BI: flexes vert col and compresses abdominal wall, used in forced exhalation

transversus abdominus function

BI: compresses abdominal wall, used in forced exhalation

rectus abdominus function

flexes vert col, compresses abdominal wall, used in forced exhalation