Anatomy Upper Limb & Thorax by Singh. V (ELSEVIER)
The upper limb is the organ of the body, responsible for manual activities. It is freely movable, especially its distal segment— the hand, which is adapted for grasping and manipulating the objects. A brief description of comparative anatomy of the limbs would facilitate understanding of their structure and function. All the terrestrial vertebrates possess four limbs—a pair of forelimbs and a pair of hindlimbs. In quadrupeds such as dogs and buffaloes, both forelimbs and hindlimbs are evolved for transmission of body weight and locomotion. In human beings, due to evolution of erect posture, the function of weight-bearing and locomotion is performed only by the hind limbs (lower limbs) while upper limbs are spared for prehensile/manipulative activities, such as grasping, holding, picking, etc...............
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