muscle 1 - Muscular System Anatomy & Physiology I Dr....

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Muscular SystemAnatomy & Physiology IDr. Auguste
Types of TissuesMuscleCardiacSmoothSkeletalNervousEpithelialConnective
Skeletal Muscle OverviewVoluntary muscleStriatedAlternating light and dark bands (repeated sections ofsarcomeres)Sarcomere is the contractile unit of muscleThe proteins that make up a sarcomere slide past each otherduring each contractionMultinucleatePlasma Membrane = SarcolemmaModified ER = Sarcoplasmic Reticulum
Muscle PhysiologyI band: contains thin filamentsZ disc: cuts through the I bandA band: where thick and thin filaments go over each otherH zone: cuts through the A band; composed of thick filamentsM line: cuts through H zone
Muscle PhysiologySarcoplasmic Reticulum: stores calcium ionsTransverse Tubules: found where A and Ibands meet. It is a deep in-folding of thesarcolemma.Terminal Cisternae: enlarged areas of thesarcoplasmic reticulum. Stores calcium.
Notice The Following
Organization of Skeletal MusclesEndomysium: wraps each muscle fiberPerimysium: several wrapped muscle fibers arewrapped by this sheathFascicle: each perimysium forms a fascicleEpimysium: covers the whole cellTendons: connects muscle to boneLigaments: bone to boneCan You Name some Ligaments……..
Neuromuscular JunctionWhere nerves and muscle meetConsists of:Axon terminalSynaptic cleftMotor end plate
Axon TerminalDistal portion of an axonEach axon terminal meets up with one musclefiberContains synaptic vesicles that holds AChCausing contraction of the sarcolemma
Synaptic CleftSpace between the axon terminal and themuscle fiber
Motor End PlateHolds the receptor to which ACh will bind
Smooth MuscleNo striationsCentrally located nucleusInvoluntaryLines hollow organs
Cardiac MuscleContains intercalated discs with gap junctionsand desmosomesInvoluntary and autorhythmic

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Term
Winter
Professor
PARKER
Tags
Anatomy, hyoid bone, Muscles of the head and neck

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