88 



An Investigation into the Structure of the Lumbosacral-coccygeal 

 Cord of the Macaque Monkey (Macacus sinicus). 

 By Mabel Purefoy FitzGerald. 



(Communicated by Professor Francis Gotch, M.A., D.Sc, F.E.S. Received 

 June 17, — Read December 14, 1905.) 



The following measurements of the cross-sections of the lumbo-sacral- 

 coccygeal cord of the Macaque monkey (Macacus sinicus), with the calculations 

 made therefrom, are here given as the preliminary results of a research made 

 upon the spinal cord of this monkey. 



For the purpose of presenting the facts as clearly as possible, the paper 

 is illustrated by a series of curves based upon the above-mentioned records. 



The method of using curves to represent the areas of the grey and white 

 substance at different levels- of the cord has been adopted by former 

 investigators, namely, by Woroschiloff,* Liideritz,t Krause and Aguerre,f and 

 more recently by Donaldson and Davis§ in their paper published whilst this 

 work was in the process of completion. The above-mentioned curves were 

 constructed from measurements of the human spinal cord; the curves of 

 Woroschiloff, Donaldson and Davis, and in part those of Liideritz, being 

 based upon the measurements published by Stilling|| in his classical work 

 on the structure of the spinal cord. 



It was intended to include a comparison of the human spinal cord with 

 that of the monkey in this paper, but it is now thought advisable to publish 

 the results of these investigations separately. The work done in this direction 

 was also based upon Stilling' sll measurements of human spinal cords. 



Before entering into the details of the monkey's spinal cord, the methods 

 employed in the research are here described as briefly as possible. 



* Woroschiloff, " Der Verlauf der Motorischen und Sensiblen Bahnen durch das 

 Lendenmark des Kaninchens," 'Berichte iiber die Verhandlungen der Koniglich Sacli- 

 sischen Gesellsch. der Wissenschaften zu Leipzig,' vol. 26, 1874. 



t Liideritz, C, " Uber das Eiickenmarksegment. Em Beitrag zur Morphologie und 

 Histologic des Riickenmarks," ' Archiv f. Anatomie u. Entwickelungsgeschichte,' Anat. 

 Abtheil, 1881, pp. 423—495. 



\ Krause, R., and Aguerre, J., " Untersuchungen iiber den Bau des menschlichen 

 Riickenmarkes mit besonderer Beriicksichtigung der Neuroglia,"' Anatomischer Anzeiger,' 

 vol. 18, 1900. 



§ Donaldson, H. H., and Davis, D. J., " A Description of Charts showing the Areas of 

 the Cross-sections of the Human Spinal Cord at the Level of each Spinal Nerve," ' The 

 Journal of Comparative Neurology,' vol. 13, No. 1, 1903. 



|| Stilling, B., 'Neue Untersuchungen iiber den. Bau. des Ruckenmarkes,' Ca.ssei, 1859. 



H Stilling, B., ibid. 



