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Vertebrate Muscle Innervation and Contraction

Flash (SWF) Format


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Flash Format*


Zip File Size - 2.2 MB

(Videos are .swf format)

WMV Format **


Zip File Size -29.4 MB

(Suitable for PowerPoint)

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**WMV format scenes do not have interactivity or link between scenes. They are suitable for use in PowerPoint slides. The .wmv format plays in the PC Media Player which allows forward-back search within the scene.

***Quicktime files (.mov) do not have interactivity and scenes are not linked, but the Quicktime player allows foward/back search within a scene.

- Description -

The animation describes the relationship between muscle fibers and their innervation for vertebrate muscles.  Motor units are identified and the motor endplate on the fiber surface is discussed.  A close-up of the neuromuscular junction (motor endplate) describes how a nerve impulse activates the muscle fiber to produce an action potential in the fiber and initiate contraction. The scene shows the relationship between nerve stimuli and the amount of muscle shortening to illustrate graded muscle contractions.

Total Runtime: approx. 8 min; 4 scenes

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