In this paper are presented certain changes in technic for the use of the stereotaxic instrument (Horsley and Clarke1) which have been introduced sincé the publication of a former paper dealing with this subject (Ranson2).
Rotation of the vertical needle carrier in the sagittal plane is sometimes advantageous in order to insert the needle or electrode into the brain of an experimental animal in a direction other than the perpendicular plane of the conventional machine. This has been accomplished in this laboratory by pivoting the vertical needle carrier so that it can be rotated in the sagittal plane to any desired angle up to 45 degrees from the vertical position. The construction of this pivoted needle carrier can readily be understood from the photographs reproduced in the accompanying figure. The coordinates employed for locating any point in the interior of the brain when the pivoted needle carrier is
Harrison F. MODIFICATIONS IN TECHNIC FOR USE OF THE HORSLEY-CLARKE STEREOTAXIC INSTRUMENT. Arch NeurPsych. 1938;40(3):563–565. doi:10.1001/archneurpsyc.1938.02270090157009
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