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KMID : 0855520110240020097
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Korean Journal of Physical Anthropology
2011 Volume.24 No. 2 p.97 ~ p.103
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Spinal Nerve Compositions of the Terminal Branches of the Lumbosacral Plexus
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Woo Jung-Su
Hur Mi-Sun
Kim Ho-Jeong
Lee Kyu-Seok
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Abstract
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The purpose of this study was to classify the spinal nerve compositions of the terminal branches of the lumbosacral plexus, providing data of their participating quantities. Twenty-five sides of the lumbosacral plexus extracted from Korean adult cadavers were used in this study.
The iliohypogastric nerve was mostly arisen from L1 (88.2%, thickness L1 0.7 ㎜). The ilioinguinal nerve was arisen from only L1 (100%, thickness L1 0.6 ㎜). The genitofemoral nerve was commonly arisen from L1 and L2 (62.5%, thickness L1 0.6 ㎜, L2 0.7 ㎜). The lateral femoral cutaneous nerve was classified into 4 types, and the most common type was that L2 and L3 composed this nerve (56.0%, thickness L2 0.8 ㎜, L3 0.4 ㎜). The femoral nerve was classified into 2 types, and it was usually composed of L2, L3 and L4 (88.0%, thickness L2 1.4 ㎜, L3 2.7 ㎜, L4 2.3 ㎜). The obturator nerve was arisen from L2, L3 and L4 in all cases (100%, thickness L2 0.5 ㎜, L3 1.3 ㎜, L4 1.1 ㎜). The common fibular component of sciatic nerve was mostly arisen from L4, L5, S1 and S2 (84.0%, thickness L4 0.9 ㎜, L5 2.0 ㎜, S1 2.1 ㎜, S2 1.2 ㎜). The tibial component of sciatic nerve was mainly arisen from L4, L5, S1 and S2 (96.0%, thickness L4 0.9 ㎜, L5 1.9 mm, S1 2.2 ㎜, S2 1.9 ㎜). The superior gluteal nerve was commonly derived from L4, L5 and S1 (56.0%, thickness L4 0.7 ㎜, L5 1.1 ㎜, S1 0.9 ㎜). The inferior gluteal nerve was comprised of L5, S1 and S2 in several cases (54.2%, thickness L5 0.9 ㎜, S1 1.3 ㎜, S2 0.8 ㎜). The posterior femoral cutaneous nerve was composed of S1 and S2 in higher freqeuncy (40.0%, thickness S1 0.9 ㎜, S2 1.0 ㎜, S3 0.8 ㎜). The perforating cutaneous nerve was arisen from S2 and S3 in higher frequency (56.0%, thickness S1 0.7 ㎜, S2 0.9 ㎜, S3 1.1 ㎜). The pudendal nerve was derived from S3 in many cases (52.9%, thickness S3 1.5 ㎜).
These anatomical results may be helpful to predict the spinal nerve root lesions of the lumbosacral plexus.
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KEYWORD
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Lumbosacral plexus, Terminal nerve, Variation of spinal nerve, Participation quantity
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