The major ones are called erectors and they extend the spinal column.
the muscles in the back help stablize the spine
These muscles are the core and they give proper posture to the body. That is they support the spine and maintain their optimal position and in turn helps in protecting the spine. for spine, maintaining proper posture is the best protection. So along with lower back muscles the abdominal and oblique muscles help protect the spine
voluntary muscles
Yoolo
The erector spinae
Involuntarily controlled muscles
Skeletal muscles can be consciously controlled during exercise, whereas cardiac and smooth muscles cannot be consciously controlled.
muscles
nerves
shenomandibular ligament
Poor posture puts stress on back and neck muscles, and stresses the spine - when the spine is twisted, it affects the nervous system, and stiff muscles can be painful.
Well there are actually 3 not 2 and they are; The extensor muscles The oblique muscles The flexor muscles Hope that helps