Final answer:
The Erector spinae is located in the back and comprises three subgroups—iliocostalis, longissimus, and spinalis. It primarily functions to extend the vertebral column, control flexion, lateral flexion, and rotation, and maintain proper posture and lumbar curve.
Step-by-step explanation:
The Erector spinae is located in the back and is considered a primary extensor of the vertebral column. This muscle group has crucial roles that include controlling flexion, lateral flexion, and rotation of the vertebral column. Additionally, it provides essential postural support and maintains the lumbar curve. The Erector spinae consists of three subgroups: the iliocostalis (laterally placed), the longissimus (intermediately placed), and the spinalis (medially placed) groups. These subgroups work together to perform the movement and stabilization of the back and neck essential for everyday activities.
The erector spinae group forms the majority of the muscle mass of the back and it is the primary extensor of the vertebral column. It controls flexion, lateral flexion, and rotation of the vertebral column, and maintains the lumbar curve. The erector spinae comprises the iliocostalis (laterally placed) group, the longissimus (intermediately placed) group, and the spinalis (medially placed) group.