1. More moveable part moves towards the less moveable part. 2. The distal bone/part moves towards the proximal bone/part
Origin: Proximal attachment. ( Where the muscle starts) Muscle contracts towards the origin Less movable OR stationary part Insertion: Distal attachment More movable part
1. What aspect/view am I looking at? 2. How many joints does it cross? 3. Where is the more movable or distal attachment going to move? 4. Line of Pull. String attached at I and pulls (gets shorter) towards O.
EXTENSION, ULNAR DEVIATION EXT. ROT., ABD WHEN FLEXED.
THUMB FLEXION PLANTARFLEXION, INVERSION