Which is an eccentric function of the erector spinae group?
A)restrains/slows flexion of the trunk and neck and head at the spinal joints
B)restrains/slows extension of the trunk and neck and head at the spinal joints
C)restrains/slows ipsilateral rotation of the trunk and neck and head at the spinal joints
D)restrains/slows extension of the arm at the glenohumeral joint

Question

Quizplus · Accepted Answer

Eccentric functions involve controlling the motion of a joint by lengthening the muscle, and in the case of the erector spinae, this includes controlling or slowing down the flexion of the trunk, neck, and head at the spinal joints, not extension or rotation. This is because the primary action of the erector spinae is to extend these parts, so it acts eccentrically to control the opposite motion, which is flexion.

Which Is an Eccentric Function of the Erector Spinae Group