Illustrated Encyclopedia of Human Anatomic Variation: Opus III: Nervous System
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
The connections between the lumbar and the sacral plexus
were examined bilaterally in 122 subjects. In 91.8% of subjects the
plexuses were joined, by a single nervus furcalis and in 0.8% by a
doubled nervus furcalis. The single furcal nerve was formed by the
abdominal nerve L4 in 80% and L5 in 7.7% of cases. The doubled furcal
nerve arose from L3 and L4 in 0.4% of cases and from L4 and L5 in
0.4%. Usually, the major part of the furcal nerve arising from L4
went to the lumbar plexus, and from L5 to the sacral plexus. In 7.4%
of cases no connection between the plexuses could be found.
Authors' note: Urbanowiez considers illustrations A through E be type I variations, F through J to be type II, K to be type III, and L to be type IV
L3 to L5, respective lumbar nerves; fem, femoral nerve; ob, obturator nerve.
Redrawn from Urbanowicz, Z. Connections between the lumbar and the sacral plexus in man. Folis Morphol. 40:271-279, 1981.
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