L1 NERVE

 

ORIGIN: Spinal cord segment L1.

COURSE/DISTRIBUTION: This nerve takes origin from spinal cord segment L1 and leaves the vertebral canal by passing through the intervertebral foramen between L1 and L2 vertebrae. It immediately divides into two rami- dorsal and ventral rami.

Dorsal ramus:

It immediately turns backwards, medial to the medial intertransversarii and then divides into its terminal branches- medial and lateral.

bulletThe medial branch immediately passes to the multifidus where it ends.
bulletThe lateral branch runs laterally and ends in the erector spinae group and gives several cutaneous branches, which supply the skin of the gluteal region.

Ventral ramus:

The ventral ramus of L1 is joined by a communication from T12 nerve. It then splits into upper and lower branches. The lower branch immediately joins the lumbar plexus by joining the ventral ramus of L2 to form the genitofemoral nerve. The upper branch immediately divides into its two terminal branches the ilioinguinal nerve and the iliohypogastric nerve.

BRANCHES.

bulletCutaneous branches
bulletMuscular branches
bulletDorsal ramus
bulletVentral ramus
  1. Branch to the lumbar plexus
  2. Other branch
    1. Iliohypogastric nerve
    2. Ilioinguinal nerve.

ROOT VALUE: T11

 

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Creator: Oluwole Ogunranti


 

 

 

 

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Creator: Oluwole Ogunranti