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L. DESCLIN
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M. COSYNS
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The many discrepancies in the results of experiments on pituitary stalk section, reported in the literature, are almost certainly due in part to the great difficulties involved in the performance of this operation. Therefore, we have thought it of some interest to give a detailed description of a relatively simple apparatus devised for this purpose and which has been used by one of us with good results since 1940.

For much of its course, the pituitary stalk lies in direct contact with the basisphenoid and is thus relatively easy to reach, if approached from the base of the skull. Nevertheless, the use of the classical parapharyngeal route universally adopted for hypophysectomy in the rat meets with almost insuperable difficulties as regards obtaining a good view of the pituitary stalk, which is located too far anteriorly, and the operation so conducted remains a blind operation.

For this reason, without rejecting the

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