Final answer:
The right-side erector spinae muscles, including the iliocostalis lumborum and thoracis, longissimus group, multifidus, and intertransversarii, act as antagonists for lateral flexion of the vertebral column to the left.
Step-by-step explanation:
The muscles that would act as antagonists for lateral flexion of the vertebral column on the left side are the muscles that perform lateral flexion to the opposite side. When the vertebral column laterally flexes to the left, the muscles on the right side of the spine act as antagonists to control or oppose the movement.
These include the right-side muscles of the erector spinae group — specifically, the iliocostalis lumborum and thoracis, and the longissimus group (particularly the longissimus thoracis), as well as the right multifidus and the right intertransversarii muscles.
The erector spinae group acts as antagonists for lateral flexion of the vertebral column on the left side. This muscle group is responsible for extending, laterally flexing, and rotating the vertebral column.