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Intrafusal vs. Extrafusal Fibers
N/A
10
Anatomy
Undergraduate 2
09/19/2012

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Term
extrafusal fiber
Definition
make up large mass of skeletal (striated) muscle
Term
extrafusal fibers
Definition
attached to bone by fibrous tissue extensions (tendons)
Term
extrafusal fibers
Definition
controlled by alpha motor neurons (does motor act of any sort)
Term
extrafusal fibers
Definition
composed by myosin filaments
Term
extrafusal fibers
Definition
responsible for contractibility of a muscle
Term
intrafusal fibers
Definition
contain muscle spindles
Term
intrafusal fibers
Definition
attached to extrafusal fibers
Term
intrafusal fibers
Definition
controlled by gamma-motor neurons
Term
intrafusal fibers
Definition
both ends contract
Term
intrafusal fibers
Definition

central region does not contract (only stretches)

*think of rubber band

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