ORIGINAL: Matt / PA
Probably lymph nodes?........I think all mammals have lymph nodesthroughout the body with concentrations in the neck, armpit or groin areas.
They are fairly superficial which is why you can palpate them when you are sick.[:'(]
That's as good a guess as any...and Matt usually seems to know his stuff. (note the usually there) Plus, he has an extremely sweet avatar under his name.