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Makeup of muscles, Rules of muscles, what tendons and ligaments connect
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A
Tendon

B
Epimysium

C
Perimysium

D
Fascicle

E
Endomysium

F
Muscle Fiber/ Cell

G
Myofibril
Muscle Rule 1
Muscles must have at least two attachments and must cross at least one joint.
Muscle Rule 2
Muscles always “pull” and get shorter.
Muscle Rule 3
The attachment that moves is known as the insertion and the attachment that remains stationary is known as the origin
Muscle Rule 4
Muscles that decrease the angle between ventral surfaces of the body are known as flexors. Muscles that increase the angle between ventral surfaces of the body are known as extendors.
Muscle Rule 5
Muscles work in opposing pairs
Muscle Rule 6
Muscle fibers point to the attachments and show the direction of pull
What do tendons connect?
They connect bone to bone
What do ligaments connect?
Muscle to bone (Achilles tendon)
What is the origin of a muscle?
It is the connection to the bone that does NOT move with the contraction of the muscle

What is the insertion of a muscle?
It is the connection to the bone that DOES move with the contraction of the muscle
