Slide 1Muscle TypesSkeletal muscle fibersSkeletal muscle cont.Skeletal muscleCardiac muscleSmooth MuscleCell structure of skeletal muscleStructure of a skeletal muscle fiberStructure of a skeletal muscle fiberNeuromuscular JunctionsThe EndExercise 10Muscle histologyMuscle TypesSkeletal – attached to bone by tendons is responsible for voluntary movements.Cardiac- located in heartSmooth- located in the walls of internal organs, blood vessels, and airwaysSkeletal muscle fibersConnective tissue layers:Epimysium- around the entire musclePerimysium surrounds bundle of muscle fibers (fascicle)Endomysium-surrounds each muscle fiberSkeletal muscle cont.Striations in appear because of alternating light and dark bands from the arrangement of the thick and thin protein filaments called myofibrils.Skeletal muscleCardiac muscleForms branching networks.StriatedLinked together by intercalated discsSmooth MuscleWidest in middle and tapered toward each end.Single nucleusCell structure of skeletal muscleActin- main component of thin filaments.Myosin- main component of thick filamentsTogether these are called myofilaments which are packaged into parallel bundles called myofibrils.Structure of a skeletal muscle fiberStructure of a skeletal muscle fiberSarcolemma or cell membraneT-tubules-continuous with the sarcolemma and travel into the cytoplasmSarcoplasmic reticulum-SERCisternae- saclike extensions of the SRNeuromuscular JunctionsSynaptic terminal- the expanded knob at the end of the nerve fiberMotor end plate-the region of the sarcolemma associated with the neuromuscular junctions.Synaptic cleft- narrow space between the cell membraneThe EndView the different types of muscle under the microscope.Be able to ID the various terms on models, pictures or on
View Full Document
Unlocking...