Hand of whether the three digits of the bird hand involved the same homologous loss of two digits as in the dinosaur hand. The human hand normally has five digits: four fingers plus one thumb; these are often referred to collectively as five fingers, however, whereby the thumb is included as one of the fingers. It has 27 bones, not including the sesamoid bone, the number of which varies between people, 14 of which are the phalanges (proximal, intermediate and distal) of the fingers and thumb. The metacarpal bones connect the fingers and the carpal bones of the wrist. Each human
Hand transplantation comparison, a typical heart transplant operation lasts 6 to 8 hours. Surgeons usually connect the bones first, followed by tendons, arteries, nerves, veins, and skin. The recipient of a hand transplant needs to take immunosuppressive drugs similar to other transplants such as kidneys or livers, as the body's natural immune system will try to reject, or destroy, the hand. These drugs cause the recipient to have a weaker immune system which may lead to an increased risk of infections and some cancers. There have been many advances in solid organ transplantation over the years that have made these medications quite