Kin 2500 Muscles

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O: origin
I: insertion
A: action
Lever: rigid structure that moves around a fixed point fulcrum * Effort: causes the movement; force that is due to the muscular contraction; you only get motion when the effort that is applied at the insertion point exceeds the load * Load/Resistance: opposes that movement

* 1st class levers: not very common; fulcrum is fixed between effort and load * 2nd class levers: standing on tip toes; fairly uncommon; the load is between the fulcrum and the effort * 3rd class levers: most common; effort is between the fulcrum and the load; i.e. flexor of our elbow Anatomical Position:

On legs: flexor on posterior; extensor on anterior

Movement is the result of many muscles
Opposing Actions the prime mover/agonist is going to be responsible for the action while the other muscle is the antagonist * Supinator: prime mover/ agonist
* Pronator: opposing/ antagonist
Synergist: stabilizes intermediate joints
Fixator: stabilizes the origin of the agonist so this agonist can work more efficiently

Characteristics that are used to name muscles:
1. Direction of muscle fibers
a. Rectus: run parallel to the midline
b. Transverse: runs transversely
c. Oblique: run at an angle
2. Size of the muscle
d. Maximus: largest
e. Minimus: smallest
f. Longus: longest
g. Brevis: shortest
h. Longissimus: widest
i. Magnus: large
j. Major:
k. Minor:
l. Vastus: great
3. Shape of the muscle
m. Deltoid: triangle
n. Trapezius: trapezoid
o. Seratus: saw tooth
p. Rhomboidous: diamond shaped
q. Orbicularis: Circle
r. Pectinate: Cone
s. Puriformous: pear shaped
t. Platous: flat
u. Bigradous: square
v. Briscillous: slender
4. Action of the muscle:
w. Flexor/extensor
x. Abduction/adduction
y. Levator: elevates
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