Iliohypogastric nerve

The iliohypogastric nerve is a nerve that originates from the lumbar plexus that supplies sensation to skin over the lateral gluteal and hypogastric regions and motor to the internal oblique muscles and transverse abdominal muscles.

Iliohypogastric nerve
Plan of lumbar plexus. (Iliohypogastric visible at upper left.)
The lumbar plexus and its branches. (Iliohypogastric visible at upper left.)
Details
Fromlumbar plexus
InnervatesSensory: Skin over the lateral gluteal region and above the pubis[1]
Motor: internal and transverse abdominal muscles
Identifiers
LatinNervus iliohypogastricus
TA98A14.2.07.003
TA26496
FMA16482
Anatomical terms of neuroanatomy

Structure

The iliohypogastric nerve originates from the superior branch of the anterior ramus of spinal nerve L1.[2] It also receives fibers from T12 via the subcostal nerve.[2] The branch below it is the ilioinguinal nerve.[2]

It emerges from the psoas major in the outer part of its upper border.[3] It then crosses in front of the quadratus lumborum muscle to an area superior to the iliac crest.[3] It runs behind the kidneys. Near the iliac crest, the iliohypogastric nerve then pierces through the transversus abdominis muscle. It divides into a lateral cutaneous branch and an anterior cutaneous branch between the transversus abdominis muscle and the internal oblique muscle.

Lateral cutaneous branch

The lateral cutaneous branch ("iliac branch") pierces the internal oblique muscles and the external oblique muscles immediately above the iliac crest.[3] It is distributed to the skin of the gluteal region, behind the lateral cutaneous branch of the subcostal nerve; the size of this branch bears an inverse proportion to that of the lateral cutaneous branch of the subcostal nerve.

When harvesting bone from the anterior iliac crest (AICBG), the lateral cutaneous branch of the Iliohypogastric nerve (L1) is most likely to be injured.

  • Area supplied by the lateral cutaneous branch can be seen in blue near the hip.

Anterior cutaneous branch

The anterior cutaneous branch ("hypogastric branch") continues onward between the abdominal internal oblique and transverse muscles.

It then pierces the internal oblique, becomes cutaneous by perforating the aponeurosis of the external oblique about 2.5 cm above the subcutaneous inguinal ring, and is distributed to the skin of the hypogastric region.

Communication

The iliohypogastric nerve communicates with the subcostal nerve and ilioinguinal nerves.[2]

Variation

The iliohypogastric nerve may be absent in up to 20% of people.[4] Its fibres are instead carried on other nerves, such as the ilioinguinal nerve.[4]

Function

The iliohypogastric nerve partially supplies the internal oblique muscles.[3] It also provides sensory innervation to the superior gluteal region and part of the suprapubic region.[3]

Clinical significance

The iliohypogastric nerve may be damaged at the points where it passes through the internal oblique muscle and the external oblique muscles.[5] It is most often damaged by medical error.[3] It may also be damaged by a nerve lesion.[3]

References

This article incorporates text in the public domain from page 950 of the 20th edition of Gray's Anatomy (1918)

  1. med.mun.ca
  2. Apaydin, Nihal (2015-01-01), Tubbs, R. Shane; Rizk, Elias; Shoja, Mohammadali M.; Loukas, Marios (eds.), "Chapter 47 - Variations of the Lumbar and Sacral Plexuses and Their Branches", Nerves and Nerve Injuries, San Diego: Academic Press, pp. 627–645, ISBN 978-0-12-410390-0, retrieved 2021-01-29
  3. H. Kim, Daniel; A. Murovic, Judith (2008-01-01), Kim, Daniel H.; Midha, Rajiv; Murovic, Judith A.; Spinner, Robert J. (eds.), "11 - Lower extremity nerve injuries", Kline and Hudson's Nerve Injuries (Second Edition), Edinburgh: W.B. Saunders, pp. 209–278, ISBN 978-0-7216-9537-2, retrieved 2021-01-29
  4. Aasar, YH (1947). "Anatomical Anomalies". Fouad I University Press, Cairo.
  5. Mirjalili, S. Ali (2015-01-01), Tubbs, R. Shane; Rizk, Elias; Shoja, Mohammadali M.; Loukas, Marios (eds.), "Chapter 45 - Anatomy of the Lumbar Plexus", Nerves and Nerve Injuries, San Diego: Academic Press, pp. 609–617, ISBN 978-0-12-410390-0, retrieved 2021-01-29
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