The Neurones and Supporting ELEHENTg 



OF THE tiRAlN OF A ^ELAi^HIAN 



Gilbert L. Houser 



Professor of Animal Morphology in the Uniuersitq of Iowa 



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With Plates T-VIII. 



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TABLE OP COMTSNTS 



Section I. INTRODUCTORY ...... 3 



Section II. REVIEW OP EARLIER RESEARCHES 6 



1. Anatomical Work Involving Errors of In terpre t a t i on6 



2. Work on the Microscopical Anatomy of the Braii 9 



Section III. METHODS OP INVESTIGATION .... 15 



1. Chrome-Silver Inpre^na t ion ... 15 



2. The Application of Methylen-Blue . . . 17 



a. The Staining Method of Nissl ... 17 



b. Intra-Vitum Injection ..... 19 



3. Iron Haeuatoxy 1 i n ....... 21 



4. The Chloriie of Vanaiium Methol .... 22 



Section IV. THE 0BL0N3ATA 23 



1. General Morphology of the Oblongata ... 23 



2. Review of Nerve Components ..... 26 



3. Neurones of the Ventral Cornu .... 32 



a. Tract-Neurones ....... 32 



