The normal and pathological circulation in the central nervous system (Myel-encephalon) Original studies / by William Browning.

Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: The normal and pathological circulation in the central nervous system (Myel-encephalon) Original studies / by William Browning. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    similar to each other that they also can be summarized together. In each the outcome was positive. For first study of. the whole cord the injection was made from the cervical region. But, to obtain the best results, the cannula in two was inserted in the dorsal region. The appearance of the nerves above the lumbars (t.e., of the dorsals and cervicals) was the same as in all the post- natal subjects. There was no extension of the material along these beyond the root ganglia, and neither was there any bluing of the nerves from the extremity of the cord, including the sciatics. The direction of the efferents was found to be invariably towards the abdominal cavity. The roots and trunk of the anterior crural nerve are the main paths, and along these the material may pass well down into the pelvis. In one case the nerves that follow around the flank (ileo-hypogastric, etc.) had participated. In one there was considerable diffuse bluing of the psoas muscle towards its insertion (indicating that the material had escaped from any direct arachno- spinal extensions), in this respect corresponding to an ob- servation on the dog above cited. Not even in these foetal examples have the sciatics ever shown any injection, though in animals such a result hcis been described. DISCUSSION. My results, taken together with the facts previously known, lead to a very definite conclusion, and one with which they all harmonize completely. Outlets for the cerebro-spmal fluid exist along the lumbar nerves in the lower animals at all ages, but in the human only during foetal or uterine life. The monkey may represent an intermediary.