UMass Amherst KIN 460 - Neural signals- the neuromuscular junction Handout (5 pages)

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Neural signals- the neuromuscular junction Handout



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Neural signals- the neuromuscular junction Handout

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Pages:
5
School:
University of Massachusetts Amherst
Course:
Kin 460 - Motor Control

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Questions Neural signals The neuromuscular junction Postural Control in Multiple Sclerosis Stability and Complexity Analyses Brief review of muscle structure Nerve stimulus and the neuromuscular junction University of Massachusetts Amherst Department of Kinesiology Connective tissue sheaths of skeletal muscle epimysium perimysium and endomysium Microscopic anatomy of a skeletal muscle fiber Photomicrograph of portions of two isolated muscle fibers 700x Notice the obvious striations alternating dark and light bands Bone Nuclei Dark A band Light I band Epimysium Epimysium Fiber Perimysium Tendon Endomysium Muscle fiber in middle of a fascicle Diagram of part of a muscle fiber showing the myofibrils One myofibril extends from the cut end of the fiber Sarcolemma Mitochondrion Myofibril Blood vessel Perimysium wrapping a fascicle Endomysium between individual muscle fibers Dark A band Thin actin filament Nucleus Z disc H zone Z disc Small part of one myofibril enlarged to show the myofilaments responsible for the banding pattern Each sarcomere extends from one Z disc to the next Thick myosin filament Z disc Muscle fiber Light I band I band A band Sarcomere M line I band Enlargement of one sarcomere sectioned lengthwise Notice the myosin heads on the thick filaments M line Z disc Thin actin filament Elastic titin filaments Thick myosin filament Fascicle Perimysium 2013 Pearson Education Inc Cross sectional view of a sarcomere cut through in different locations Myosin filament Actin filament I band thin filaments only H zone thick filaments only M line thick filaments linked by accessory proteins Outer edge of A band thick and thin filaments overlap 1 Microscopic anatomy of a skeletal muscle fiber Microscopic anatomy of a skeletal muscle fiber Diagram of part of a muscle fiber showing the myofibrils One myofibril extends from the cut end of the fiber Sarcolemma Mitochondrion Myofibril Dark A band Light I band Nucleus Sarcolemma plasma membrane Sarcoplasm cytoplasm of muscle cell large glycosomes and hemoglobin Z disc H zone I band A band Sarcomere Z disc I band M line Muscle contraction 1 Sarcomere shortens 2 I band shortens 3 H zones disappear 4 A bands move closer together but length stays the same Muscle structure Microscopic anatomy of a skeletal muscle fiber Z disc Thin actin filament Small part of one myofibril enlarged to show the myofilaments responsible for the banding pattern Thick Each sarcomere myosin extends from one Z filament disc to the next Sarcomere M line Z disc Enlargement of one sarcomere sectioned lengthwise Notice the myosin heads on the thick filaments Sliding filament model during contraction myosin and actin slide past each other intermittently through cross bridges Thin actin filament Elastic titin filaments Thick myosin filament Muscle contraction is controlled by the nerve initiated electrical impulses that travel along the sarcolemma T tubules continuations of sarcolemma signal travels to the deepest parts of muscle



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