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Fig 1 |
Fig 2 |
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Fig. 3 |
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Ok lets take each of the images and come up with what type of muscle it is. Fig 1 - Ok, by the look of the organization of the connective tissue around it and the color, we can rule out smooth muscle, and it is a toss up between Skeletal and Cardiac. So What tells us what is it is? THe green arrows are pointing to the key, that is the centrally located nuclei. Once we see that we don't need anymore info we can safely say it is Cardiac muscle. Also don't forget that cardiac muscle fibers are made up of many cells connectec by Intercelated discs. Fig 2 - Looks very similair to the the Fig 1, so we can rule out smooth muscle again. So what is the key to the answer here? It is what the red arrows are pointing to. Notice that there are NO nuclei located with in the red tissue, they are all pushed to the sides. That leads us to conclude that this is a slide of Skeletal Muscle. Fig 3 - Well by elimination we can say that fig 3 is Smooth muscle but how could we conclude that anyway? Well it doesn't look highly organized, it looks very cellular but the blue arrows are pointing to one of the biggest clues. Can you see how there are three different sizes of nuclei in that little area (blue arrows). That is becuase your catching different sections of the spindle shaped nuclei of the smooth muscle cells. With that clue you can safely call this tissue Smooth Muscle. |
