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Transcript 
Muscle Types
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
The Muscular System
 Movement
 3 types
 Skeletal
 Cardiac
 Smooth
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Characteristics of Muscles
 Muscle cells elongated
(muscle cell = muscle fiber)
 Contraction due to movement of myofilaments
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Skeletal Muscle Characteristics
 Tendons
 Multinucleate
 Striated, voluntary
 Cells surrounded/bundled by connective
tissue
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Connective Tissue Wrappings of Skeletal
Muscle
 Epimysium – covers
entire skeletal muscle
Figure 6.1
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Skeletal Muscle Attachments
 Epimysium blends into tendon
 Sites of muscle attachment
 Bone
 Cartilage
 Connective tissue coverings
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Connective Tissue Wrappings of Skeletal
Muscle
 Perimysium – around a
fascicle (bundle) of
fibers
 Endomysium –
surrounds muscle fiber
Figure 6.1
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Microscopic Anatomy of Skeletal Muscle
 Cells multinucleate
 Nuclei just beneath sarcolemma
Figure 6.3a
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Microscopic Anatomy of Skeletal Muscle
 Sarcolemma – specialized plasma membrane
 Sarcoplasmic reticulum – specialized smooth
endoplasmic reticulum
Figure 6.3a
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Microscopic Anatomy of Skeletal Muscle
 Myofibril
 Bundles of myofilaments
 Myofibrils aligned to give distinct bands
 I band = light band
 A band = dark band
Figure 6.3b
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Microscopic Anatomy of Skeletal Muscle
 Sarcomere
 Contractile unit of a muscle fiber
 Z disc to Z disc
Figure 6.3b
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
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