The prime mover for back extension is the Erector Spinae. It consists of three groups ( longissimus, iliocostalis, and spinalis)
composed of two muscles Iliacus and psoas major Iliacus: prime mover for flexing thigh or for flexing trunk on thigh on thigh during a bow. Psoas major: same as iliacus, also effects latera flexion of vertebral column; important postural muscle.
In your trunk twist the lumber vertebrae mostly take part. In this the facet joints are used. The orthopedic surgeons use the term, facet joint. The anatomists call it as zygapophyseal joints.
Trunk isnt a muscle. It refers to the torso or upper part of the body.
which trunk muscle allows you to adduct your arms? which shoulder muscle allowed you to adduct your arm? which trunk muscle allows you to elevae your shoulders?
no
The trunk is made of muscle so that it can be flexible and free in movement.
Rectus abdominis is the prime agonist and the superior and inferior oblique muscles are synergists. Erector spinae is an antagonist including a number of other muscles of the back.
140 bones. Except the trunk. Everything in the trunk is muscle.
Trunk flexion & unilateral trunk flexion.
The primary flexor of the vertebral column is the rectus abdominis muscle, which is located in the front of the abdomen. It plays a key role in bending the spine forward and stabilizing the core during various activities.
trunk flexion lateral trunk flexion