Lecture 6 Sep-27-2011 chapter 10 - Ch-10 Muscle TissueBio...

Unformatted text preview: Ch-10 Muscle Tissue9/27/2011Bio 2870 A & PIntroduction to Anatomy and PhysiologyChapter 10 Muscle TissueCh-10 Muscle Tissue9/27/2011Bio 2870 A & P24-8 MUSCLE TISSUEI.SkeletalII. CardiacIII.Smooth Ch-10 Muscle Tissue9/27/2011Bio 2870 A & P3An Introduction to Muscle Tissue•Muscle Tissue–A primary tissue type, divided into•Skeletal muscle•Cardiac muscle•Smooth muscle•Skeletal Muscles–Are attached to the skeletal system–Allow us to move–The muscular system•Includes only skeletal musclesFunctions of Skeletal MusclesProduce skeletal movementMaintain body positionSupport soft tissuesGuard openingsMaintain body temperatureStore nutrient reservesCh-10 Muscle Tissue9/27/2011Bio 2870 A & P4Skeletal Muscle Structures10–1 The Organization of Skeletal MusclesCh-10 Muscle Tissue9/27/2011Bio 2870 A & P5Skeletal Muscle StructuresMuscle tissue (muscle cells or fibers)Connective tissuesNervesBlood vesselsOrganization of Connective TissuesMuscle attachmentsEndomysium, perimysium, and epimysium come together:at ends of musclesto form connective tissue attachment to bone matrixi.e., tendon (bundle) or aponeurosis (sheet)Ch-10 Muscle Tissue9/27/2011Bio 2870 A & P6Skeletal Muscle StructuresOrganization of Connective TissuesMuscles have three layers of connective tissuesEpimysium:exterior collagen layerconnected to deep fasciaSeparates muscle from surrounding tissuesPerimysium:surrounds muscle fiber bundles (fascicles)contains blood vessel and nerve supply to fasciclesEndomysium:surrounds individual muscle cells (muscle fibers)contains capillaries and nerve fibers contacting muscle cellscontains myosatellite cells (stem cells) that repair damageCh-10 Muscle Tissue9/27/2011Bio 2870 A & P7Skeletal Muscle StructuresNervesSkeletal muscles are voluntary muscles, controlled by nerves of the central nervous system (brain and spinal cord)Blood VesselsMuscles have extensive vascular systems thatSupply large amounts of oxygenSupply nutrientsCarry away wastesCh-10 Muscle Tissue9/27/2011Bio 2870 A & P8Skeletal Muscle Fibers10–2 The Formation of a Multinucleate Skeletal Muscle FiberAre very long Develop through fusion of mesodermal cells (myoblasts)Become very large Contain hundreds of nuclei Ch-10 Muscle Tissue9/27/2011Bio 2870 A & P9Skeletal Muscle FibersInternal Organization of Muscle FibersMyofibrilsLengthwise subdivisions within muscle fiberMade up of bundles of protein filaments (myofilaments)Myofilaments are responsible for muscle contraction Types of myofilaments:thin filaments: made of the protein actinthick filaments: made of the protein myosin...
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