Superficial and intermediate deep back muscles (Latin)

The superficial layer of deep back muscles consists of the two mm. splenii: m. splenius capitis and cervicis (not labeled). The intermediate layer consists of the erector spinae muscle group which is composed of three muscle columns: mm. Iliocostales, longissimi and spinales. They are regionally divided into lumbar, thoracic, cervical, and capital components.