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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.
Pectoralis Major is the correct answer -Lucein
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.
140 bones. Except the trunk. Everything in the trunk is muscle.
Trunk flexion & unilateral trunk flexion.
Gluteus maximus.
trunk flexion lateral trunk flexion