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The Muscular System
Interactions, names, and levers of muscles with pictures
20
Anatomy
Undergraduate 2
04/01/2007

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Term
Prime Movers
Definition
Provide the major force for producing a specific movement
Term
Antagonists
Definition
Oppose or reverse a particular movement
Term
Synergists
Definition
Add force to a movement. Reduce undesirable or unnecessary movement.
Term
Fixators
Definition
Synergists that mobilize a bone or muscle's origin
Term
7 Criteria that are used to name skeletal muscles:
Definition
1. Location of the muscle, 2. Shape of the muscle, 3. Relative size of the muscle, 4. Direction of muscle fibers, 5. Number of origins, 6. Location of the attachments, 7. Action
Term
Parallel Arrangement of Fascicles
Definition
Fascicles run parallel to the long axis of the muscle (sartorius) [image]
Term
Fusiform Arrangement of Fascicles
Definition
Spindle-shaped muscles (biceps brachii) [image]
Term
Pennate Arrangement of Fascicles
Definition
Short fascicles that attach obliquely to a central tendon running the length of the muscle (rectus femoris)[image]
Term
Convergent Arrangement of Fascicles
Definition
Fascicles converge from a broad origin ro a single tendon insertion (pectoralis major)[image]
Term
Circular Arrangement of Fascicles
Definition
Fascicles are arranged in concentric rings (orbicularis oris)[image]
Term
Lever
Definition
a rigid bar that moves on a fulcrum, or fixed point
Term
Effort
Definition
force applied to a lever
Term
Load
Definition
Resistance moved by the effort
Term
First Class Lever System
Definition
The fulcrum is between the load and the effort[image]
Term
Second Class Lever System
Definition
The load is between the fulcrum and the effort[image]
Term
Third Class Lever System
Definition
The effort is applied between the fulcrum and the load[image]
Term
How are muscles of the skin different from the rest of the muscles
Definition
They usually insert in the skin (rather than bone) and adjacent muscles often fuse
Term
Major Head Flexor
Definition
Sternocleidomastoid
Term
The Prime Mover of Back Extension
Definition
Erector spinae
Term
Prime movers of shoulder elevation
Definition
Trepezius and levator scapulae
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