The Muscles

1. origin & insertion- lateralis, medialis, superiorioris

2. direction of fibers- rectus, oblique, transversus

3. size- maximus, minimus

3.1. shape- deltoid, trapezius

3.1.1. action- flexor, extensor

4. 650 muscles in the human body

5. muscles comprise almost 40% of total body

6. muscles named based on location & postition

7. Facts

8. Parts of a muscle

8.1. Origin- does not move; the end of a muscle attached to a dormant bone

8.2. insertion- end of a muscle attached to a bone that moves during contraction

8.3. gaster-thick, middle portion of a muscle

8.4. tendons- muscles attached to bones by cords of connective tissue

8.4.1. aponeuroses- thin sheet-like tendons

9. Muscle Cooperation

9.1. agonist- muscle group that acts most directly and most powerfully during a given movement

9.2. antagonist- muscle within a group that defies action of anatagonist

9.3. synergists- assistants to the antagonist (necessary for smooth efficient movemen)