Archive image from page 652 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 B A, Transverse section of tlie spine at the situation of atloido-occipital articulation. (After Majendie.) c, the spinal cord. d, the dura mater and arachnoid membrane. s, s, the sub-arachnoid space, divided into an anterior and posterior portion by /, the ligamentum denticulatum. B, Section in the dorsal region. The same letters indicate similar parts as in A. m, the posterior median septum. n, the roots of the nerves. We can thus demonstrate the existenc
Archive image from page 652 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 B A, Transverse section of tlie spine at the situation of atloido-occipital articulation. (After Majendie.) c, the spinal cord. d, the dura mater and arachnoid membrane. s, s, the sub-arachnoid space, divided into an anterior and posterior portion by /, the ligamentum denticulatum. B, Section in the dorsal region. The same letters indicate similar parts as in A. m, the posterior median septum. n, the roots of the nerves. We can thus demonstrate the existence of a fluid, which during life and in a state of health occupies the sub-arachnoid cavity and main- tains the two layers of the arachnoid membrane in contact with each other. This fluid is designated by Majendie the cerebro-spinul fluid. The first distinct recognition of this fluid in its proper locality is due to Cotunnius, who stated the results of his observations in his memoir ' de Ischiade Nervosa,' preserved in Sandifort's collection of dissertations. Cotun- nius was led to the discovery by remarking the great disproportion between the dimensions of the spinal canal and the bulk of its contents, so that a considerable interval exists between the internal surface of the former and the spinal cord, which must be filled by something; and he attributes its having been so completely overlooked by previous anatomists to the fa-
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