New edition of OP:
A fossilized limb, complete with muscle and bone, was found on Mars by Mars rover Spirit on sol 1863 and sol 1866.
First, let’s familiarize with the transverse section of an Earthly human leg:
Fig.1: An illustration of human leg transverse section (Note: click on all the figures to enlarge)
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Fig. 2: A micrograph of one muscle organ
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Fig. 3: Micrograph of muscle tissues (fascicles) and muscle cells (fibers), all in transverse section
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Now here is the location of the Martian limb in transverse section: Fig.4:
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Image source and credit for Fig. 4:
www.flickr.com...
The transverse section of the limb are labelled for
its skin,muscles and bone at Fig.5:
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Image source and credit for Fig.5:
marsrovers.nasa.gov...
One of the muscles is labelled for its muscle tissues (fascicles) at Fig.6
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Image source and credit for Fig.6:
marsrovers.nasa.gov...
The muscle in Fig. 6 is labelled for its muscle cells at Fig.7
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Image source of Fig. 7 is
marsrovers.nasa.gov... , but the source image has been expanded
and cropped for the area of the labelled muscle.
Finally, the bone of the limb is identified in the following micrograph, because it shows osteon canals—the tell-tale signs of a compact bone:
Fig.8
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The source of this figure is at
marsrovers.nasa.gov... , but the original image has been
expanded and cropped for the area with the osteon canals.
Above findings were first published at this forum:
groups.google.com...