By Nigel Palastanga, Derek Field, Roger Soames
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Additional info for Anatomy & Human Movement: Structure & Function, 4th edition
The webs between the thickenings disappear freeing the digits. Appropriate spinal nerves grow down to the limbs: C5, 6, 7, 8 and Tl for the upper limb, and L4, 5, SI, 2 and 3 for the lower limb. Bones differentiate from the mesenchyme of the bud. The limbs grow in such a way that they rotate in opposite directions, the upper limb laterally and the lower limb medially (Fig. 1b). Consequently, the thumb becomes the lateral digit of the hand and the great toe the medial digit of the foot. During development the upper limb bud appears as a swelling from the body wall (Fig.
Eye medially in addition to turning it to look up 2 This page intentionally left blank Part The upper limb 3 This page intentionally left blank 43 The upper limb looked in the functional effectiveness of the hand is the important contribution made by the extensive vascular network in supporting its The human upper limb has almost no locomo- metabolic requirements. As the upper limb is also used for carrying tor function. It is instead an organ for grasping and manipulating. With the evolutionary adap- loads and supporting the body, the question tation of bipedalism the upper limb acquired a arises as to how these forces are transmitted to great degree of freedom of movement.
In spite of Remembering that the skin has essentially muscular attachments to the head, neck and been stretched over the developing limb, the thorax, the upper limits can be conveniently fifth cervical nerve in the adult is sensory to considered as the superior surface of the clavicle the cranial part of the limb, and the first anteriorly and the superior border of the thoracic to its caudal part, with the seventh scapula posteriorly. The free upper limb is cervical nerve lying in the middle of the limb.