Skeletal Muscles Dr Manodeep Chakraborty Muscular system is

Skeletal Muscles Dr. Manodeep Chakraborty

� Muscular system is formed by muscles � Cells of muscle tissues are called myocytes � Types � Striated/ Skeletal/ Voluntary muscles � Cardiac muscles � Smooth muscles

� Functions of muscular tissue � Movement of body and parts � Stabilizing body positions � Moving substances and their flow � Storing substances � Generating heat

� Properties of muscular tissue � Electrical excitability � Contractility � Extensibility � Elasticity

� Ultra structure of skeletal muscle

�Binding pattern of myofibril

� Arrangement of actin and myosin filaments

� Mechanism of muscle contraction

� Detailed mechanism and biochemical events during contraction

� Muscle fatigue � A skeletal muscle fiber is said to be fatigued when it can not contract without continued neural stimulation

� Some important properties of muscles � Single muscle twitch �The latent period � The contraction phase � The relaxation phase

� Refractory period � Wave summation & tetanus � Muscle tone � Hypotonia � Hypertonia

� Treppe or staircase phenomenon

� Isotonic Contractions � Concentric � Eccentric � Isometric Contractions

� Neuromuscular junction Anatomical details:

�Neuromuscular junction �Physiology:

� Myasthenia Gravis

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