Muscle Insertion: The distal (away from the center of body) attachment of a muscle, which is usually a relatively more moveable segment than that of the origin.
To determine the origin and insertion of a muscle, the affect the muscle's contraction has on the bones it attaches to must be considered. The origin and insertion, then, are determined by how much the bones move. As well,the relative location of the attachment to the midline or center of the body may be considered. Some muscles have various origins and insertions, making this difficult. Most muscles can be easily determined.
The insertion is determined by the part that is most movable and most acted on by the muscle's contraction. However, it is often considered the part of the muscle that fastens farthest from the midline or center of the body.
Movement of the segments in question is the more important consideration and as a general rule the insertion of a muscle is pulled toward its origin.
This page created 05 Mar 2012 23:59
Last updated 01 Mar 2016 19:55