Imagine standing and crossing your arms (i.e. so that your right hand touches your left thigh and your left hand touches your right thigh). This would be considered the fiber direction of your...
internal obliques: flexing the spine support the abdominal contents help breathe rotate the spinesave the scarecrows!
coccygeus
erector spinae for spinal extension and quadratus lumborum for spinal abduction
Tense abdominal wall and compress abdominal contents.