Lumbar plexus
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The lumbar plexus originates from the ventral rami of spinal nerves L1-L4 and provides motor and sensory contributions to the anterior and medial compartment of the leg as well as the abdominal wall and pelvic areas. It supplies the iliohypogastric nerve from L1 which innervates abdominal wall muscles and the pubic region, and the ilioinguinal nerve also from L1 which innervates abdominal wall muscles and the upper inner thigh and pubic area. The lumbar plexus connects to the sacral plexus via the lumbosacral trunk formed from parts of L4 and all of L5.
Lumbar plexus
- 1. Lumbar Plexus Daniel Vela-Duarte, MD Department of Neurology Loyola University Medical Center July 2012
- 2. Lumbar Plexus The lumbar plexus originates from ventral rami of L1–L4. It provides motor and sensory contributions to the anterior and medial compartment of the leg as well as to the abdominal wall and pelvic areas.
- 3. Iliohypogastric nerve (L1). Provides a portion of the motor innervation to the abdominal wall muscles and sensory innervation to the pubic region. Ilioinguinal nerve (L1). Provides a portion of the motor innervation to the abdominal wall muscles and sensory innervation to the superior medial thigh and pubic area. The lumbar plexus and sacral plexus are united via the lumbosacral trunk, which is comprised of a portion of L4 nerve root anterior rami, and all L5 anterior rami.