spine & thorax actions

Question 1

vertebral column flexion (5)

Answer 1

rectus absominis
external oblique (bilaterally)
internal oblique (bilaterally)
psoas major (with insertion fixed)
iliac (with insertion fixed)

Question 2

vertebral column extension (10)

Answer 2

longissiumus (bilaterally)
iliocostalis (bilaterally)
multifidi (bilaterally)
rotatores (bilaterally)
semispinalis capitis 
spinalis (bilaterally)
quadratus luborum (assists)
interspinalis
intertransversarii (bilaterally)
latissimus dorsi (assists, when arm is fixed)

Question 3

vertebral column rotation (4)

Answer 3

external oblique (to opposite side)
internal oblique (to same side)
multifidi (to opposite side)
rotatores (to opposite side)

Question 4

vertebral column lateral flexion (9)

Answer 4

iliocostalis
external oblique 
internal oblique 
longissimus
quadratus lumborum
psoas major (assists)
intertransversarii
spinalis
latissimus dorsi (assists)