Muscle Fibers Muscles are made of many individual cells called fibers The Fascia connects the individual fibers to form a muscle and it separates muscles from each other Muscles have 3 layers of CT ID: 655319
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Slide1
Muscle Physiology
How They WorkSlide2
Muscle Fibers
Muscles are made of many individual cells called fibers
The
Fascia
connects the individual fibers to form a muscle and it separates muscles from each other. Slide3Slide4
Muscles have 3 layers of C.T.
Epimysium
:
outermost layer that surrounds the whole muscle
Perimysium
:
Surrounds and separates the fascicles
Endomysium
:
surrounds each individual muscle fiberSlide5Slide6
Muscle fiber membrane:
The plasma membrane of a muscle fiber is called the
sarcolemma
The cytoplasm is called the
sarcoplasmSlide7
Inside the sarcolemma
The many parallel fibers inside the muscle cell are called
myofibrils.
Each myofibril is made of protein filaments called
myofilaments
.
The thin filaments are
actin
.
The thick filaments are called
myosin.Slide8Slide9
What is a sarcomere
?
Actin
and Myosin filaments are arranged in an overlapping pattern of light ("I" bands) and dark ("A" bands).
In the middle of each "I" band is a line called a "Z" line.
The section of a myofibril from one Z-line to the next Z-line is the SARCOMERE. Slide10
The arrangement of the
sarcomeres
produces the familiar striations of skeletal muscle.Slide11