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11 Cards in this Set

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Prime movers, agonists

Muscles most responsible for producing a particular movement

Antagonists

Muscles that oppose or reverse a movement

Synergists

Aid the action of agonists either by assisting with the same movement or by reducing undesirable or unnecessary movement


- Ex: Making a fist without bending the wrist

Fixators

Fixation muscles are specialized synergists.


Immobilize the origin of the prime mover so that all the tension is exerted at the insertion.


Ex: Muscles that help maintain posture

Criteria on which skeletal muscles are named

- Direction of muscle fibers


- Relative size of the muscle


- Location of the muscle


- Number of origins


- Location of the muscle's origin and insertion


- Shape of the muscle


- Action of the muscle

Direction of muscle fibers

Rectus (straight)


Transverse/Oblique (fibers run at right angles or obliquely)

Relative size of the muscle

Maximus (Largest)


Minimus (smallest)


Longus (long)


Brevis (short)

Number of origins

Ceps (bicepts, triceps, quadriceps)

Location of the muscle's origin and insertion

- Sternocleidomastoid (sterno - sternum; cleido - clavicle) (mastoid process)

Shape of the muscle

Deltoid (triangle)


Trapezius (Trapezoid)

Action of the muscle

Adductor muscles - adduction


Extensor muscles - extension