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 ilioinguinal nerve as present in 97.5% of 200 bodies. It
originated from the lumbar plexus independently in 72.5% of cases,
together with the iliohypogastric nerve in 25%, and was absent in
2.5% of cases.
Ten types of origin of the nerve were distinguished depending on its origin from the lumbar plexus and formation. 2.5% of The ilioinguinal nerve was formed by one root in 92.5 % of cases (A, B, D, E, F, H, I), and by two roots in 5% (C, G, J).
In 86.5% of cases, the ilioinguinal nerve arose from one spinal root (primarily L1, rarely L2) and in 11% of cases from two spinal nerves (T12, L1; L1, L2; or L2, L3).
Uniradicular nerves arose by union of the ventral branches of nerves T12, L1, (A, B) and L1, L2 (F) or directly from ventral branches L1, (D, E) and L2 (H, 1). In biradicular nerves, the upper root arose from the ventral branches of T12, (C), L1, (G), or L2 (J); and the lower root from L1 (C), L2 (G), or L3 (J).
Th12, Twelfth thoracic spinal nerve; L1-L3, respective lumbar spinal nerves; ih, iliohypogastric nerve; ii, ilioinguinal nerve.
Redrawn from Zaluska, S. External structure of the ilioinguinal nerve in postfetal life in man. Folia Morphol. 34:419-424, 1975.
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