535 first sight it was considered as an external branch of the n.accessorius but upon examining the upper cervical region of the spinal cord it was discovered that the spinal origin of the n.accessorius was absent. Since it was impossible to dissect the head, the origin of the branch could not be studied. In our animals the muscles mentioned were innervated by cervical nerves. A study of the head and the anterior part of the neck was not attempted. CONCLUSION The statement made by SLIJPER-lri long-necked Ungulates the whole trapezius-complex is exclusively innervated by cervical nerves-is incorrect. Some twenty years ago anatomists showed that in the giraffe a n.accessorius is present, but the nerve is lacking in camels and llamas. Recent investigations are in accordance with these facts. There still remain a number of interesting questions: Is the lacking of the nerve in camels caused by the length of the neck? The existence of the n.accessorius in the giraffe and the presence of a normal n. recurrens in the camel do not agree with a great influence of the length of the neck. In this connection the question arises: What relations are found in long-necked birds ? No
Archives Néerlandaises de Zoologie (in 1967 continued as Netherlands Journal of Zoology) – Brill
Published: Jan 1, 1958
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