The lumbosacral plexus comprises the ventral branches of a portion of the fourth and fifth lumbar nerves and of the three upper sacral nerves. The principal nerves arising from this plexus are the anterior crural (second, third and fourth lumbar nerves), external popliteal (fourth and fifth lumbar and first and second sacral), internal popliteal (fourth and fifth lumbar and first, second and third sacral) and obturator (third and fourth lumbar). A combined involvement of all these nerves occurred in the case here reported.
REPORT OF CASE
—A colored boy, aged 18, a laborer, admitted to the orthopedic service (Dr. Harger), Aug. 19, 1919, complaining of difficulty in walking, stated that about fourteen years before, while in perfect health, he fell on the floor with the legs widely stretched. For nine months he was unable to walk, having been all this time confined to bed. He asserted that up to