The Erector Spinae Muscle Group Is the Chief Extensor of the Vertebral

Multiple Choice

The erector spinae muscle group is the chief extensor of the vertebral column and is arranged into which three vertical columns?

A) Iliocostalis, longissimus, and splenius
B) Iliocostalis, longissimus, and spinalis
C) Iliocostalis, multifidus, and splenius
D) Iliocostalis, multifidus, and spinalis