St._John's_University_PHS_3103_Human_Anatomy_and_Physiology_I_Lecture_Outline_Chapter_10_Muscle_Tiss

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St. John’s UniversityDr. Emanuel J. PepitoneHuman Anatomy and Physiology I: PHS 3103Chapter 10 Lecture OutlineChapter 10: Muscle TissueLecture OutlineI.INTRODUCTIONA.The skeletal system provides leverage and a supportive framework foralternating contraction (shortening) and relaxation of muscles.II.OVERVIEW OF MUSCLE TISSUEA.Types of Muscle Tissue1.Skeletal muscle tissueattaches to bones by tendons andaponeuroses; and is striated and voluntary.2.Cardiac muscle tissueforms the wall of the heart and is cardiocytesand striated, involuntary.3.Smooth muscle tissueis located in walls of hollow viscera; and is non-striated (smooth) and involuntary. Reproduce.Striations- orderly repeated sequence of uniform banding of contractileproteins (actin, myosin)Skeletal -somaticCardiac- ANSSmooth-B.Functions of Muscle Tissue1.Through sustained contraction or alternating contraction andrelaxation, muscle tissue performs four (4) functions, one of which is1
production of body movements. Maintains body temperature, Storesnutrient reserves, supports soft tissue.C.Properties of Muscle Tissue1.Electrical Excitability2.Contractility3.Extensibility4.ElasticityIII.SKELETAL MUSCLE TISSUE- highly developed.A.Each skeletal muscle is a composed of many individual cells called fibers(myocyte).Long and cylindrical. Moves bone, multi-nucleated, voluntaryB.Connective Tissue Components1.Fascia:a tough sheet or band of fibrous connective tissue thatsurrounds every organ, muscle, bone, and blood vessel.a.Superficial fascia(orsubcutaneous layer): contains white andyellow fibers embedded in ground substance. Separates musclefrom skin, stores fat and protects muscles from trauma.b.Deep fascia:covers, divides, and protects muscles with similarfunction. Lines body wall, limbs.c.Clinical Application:Trigger Pointsare tight connective tissueadhesions within the deep fascia that can cause local andreferred pain.2
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2.Connective tissue membranes of muscle are:
C.Microscopic Anatomy of a Skeletal Muscle Fiber1.During embryonic development, mesenchymal cells differentiate intomyoblastswhich fuse together to formmyotubes (LARGEELONGATED TRINAGULAR CELLS). Myotubes have many peripheralnuclei. Actin and myosin are produced in myotubes. Can containhundreds of nuclei. Myofibrils formed as actin and myosin filaments

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Term
Fall
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PEPITONE
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