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This is basically a fun question, inspired by this answer on scifi.se. So, which cell type will have the greatest number of mitochondria? Obviously, I am talking about wild type, healthy individuals and am looking for a rule of thumb. I realize that the number can change under different conditions/ between different individuals.

Off the top of my head, I would say that it's sperm cells given the strenuous exercise they need to perform and their MT-packed axonemes but perhaps there are better contenders?

I am primarily interested in human cell types but answers dealing with other mammals are welcome.

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I'd expect a correlation between cell size and number of mitochondria. Therefore, my guess is that the ovule has the greatest number of mitochondria. On this wiki article it is said: "the number of mitochondria in a cell varies widely by organism and tissue type. Many cells have only a single mitochondrion, whereas others can contain several thousand mitochondria." and give two book references: Alberts and Voet. –  Remi.b Feb 6 at 23:41
    
Assuming @Remi.b 's correlation between cell size and number of mitochondria, then muscle fibers should win hands down. They are IIRC the largest cells in the body, and they have a need for significant amounts of energy. –  MattDMo Feb 7 at 5:36
    
oocyte, cardiomyocytes, skeletal muscle.. check this: esp page 11.. Oocyte has to provide miotochondria for the embryo.. so i guess it has the most –  WYSIWYG Feb 7 at 7:06
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