Lumbosacral trunk

Dr Craig Hacking et al.

The lumbosacral trunk is the distal trunk of the lumbar plexus arising from the anterior rami of the L4 and L5 nerve roots which contributes to the sacral plexus.

Gross anatomy

Origin

It arises from anterior rami of L4-L5 roots of the lumbar plexus.

Course
  • emerges over the medial border of the iliacus muscle, medial to the psoas major muscle
  • it descends to join with the S1 nerve root to contribute to the sacral plexus
Branches

The lumbosacral trunk contributes fibres to the:

Abdominal and pelvic anatomy
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Article information

rID: 38798
Section: Anatomy
Synonyms or Alternate Spellings:

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Cases and figures

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    Figure 1: lumbosacral trunk
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    Figure 2: lumbar plexus labelled
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