48 



TOPOGEAPHICAL ANATOMY OF 



humerus and the olecranon of the ulna, where it lies on the origin 

 of the superficial flexor of the digits and under cover of the tensor of 

 the antibrachial fascia. In the proximal half of the forearm the nerve 

 lies medial to the ulnar head of the deep flexor which it follows very 



Fig. 30. — Key-outline of tlie Thoracic Limb to Indicate the Level of the Transverse 

 Sections Illustrated in Subsequent Figures. 



closely. Beyond the middle of the radius it occupies a narrow interval 



between the ulnar flexor and ulnar extensor muscles. Throughout the 



grp-ier part of its course in the forearm the nerve is superficial. Close 



to the carpus it divides into a superficial and a deep branch. The 



ramus superficialis bends round the tendon of the ulnar extensor, 



pierces the deep fascia, and has already been noted as a cutaneous 

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