Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings 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 Figure 6.3b Microscopic Anatomy of Skeletal Muscle  Myofibril  Bundles of myofilaments  Myofibrils aligned to give distinct bands  I band = light band  A band = dark band

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