If a muscle crosses the spinal joints of the trunk laterally with a vertical direction to its fibers,what action of the trunk at the spinal joints will it most likely have?
A)flexion
B)extension
C)lateral flexion
D)contralateral rotation

Question

Quizplus · Accepted Answer

When a muscle crosses the spinal joints of the trunk laterally with a vertical direction to its fibers, it is most likely to produce lateral flexion of the trunk at the spinal joints. Examples of such muscles include the external oblique, internal oblique, and quadratus lumborum. These muscles contract unilaterally to produce lateral flexion of the trunk towards the same side and bilaterally to produce flexion of the trunk.

If a Muscle Crosses the Spinal Joints of the Trunk