How do muscle attachments affect a joint How does classifyin

How do muscle attachments affect a joint?

How does classifying joints according to their structure and function help to describe human movement?

Solution

1). The contraction of skeletal muscles allows the movement at synovial joints. One end of the joint is attached to the fixed or less movable joint and the other joint is attached to the freely movable joint.

The fixed end is called as “origin” and the freely movable end is known as “insertion.” The contraction of the muscle thus causes movement of the joint by pulling the insertion towards the origin.

For example, the external intercoastals are a total of eleven pairs of muscles that lie between ribs. Their origin lies on a superior rib and insertion on an inferior rib. They pull the ribs together to elevate the rib cage, this causing inspiration.