The mode in which the plexus is arranged varies in different subjects.
The remainder of the second lumbar nerve, and the third and fourth lumbar nerves, divide into ventral and dorsal divisions.
The ventral division of the second lumbar nerve unites with the ventral divisions of the third and fourth lumbar nerves to form the obturator nerve.
The dorsal divisions of the second and third nerves divide into two branches, a smaller branch from each uniting to form the lateral femoral cutaneous nerve, and a larger branch from each joining with the dorsal division of the fourth nerve to form the femoral nerve.
The accessory obturator, when it exists, is formed by the union of two small branches given off from the third and fourth nerves.
|Main||Iliohypogastric nerve||1 L.||Skin over the lateral gluteal region and above the pubis|
|Main||Ilioinguinal nerve||1 L.||Skin over the root of the penis and upper part of the scrotum (male), skin covering the mons pubis and labium majus (female)|
|Main||Genitofemoral nerve||1, 2 L.||Genital Branch: Cremaster muscle, skin of scrotum/labia majora Femoral Branch: Skin on anterior thigh|
|Dorsal||Lateral femoral cutaneous||2, 3 L.||Skin on the lateral part of the thigh|
|Ventral||Obturator nerve (and Accessory obturator nerve, when present)||2, 3, 4 L.||Medial compartment of thigh|
|Dorsal||Femoral nerve||2, 3, 4 L.||Anterior compartment of thigh|
|Ventral||Lumbosacral trunk||4, 5L., 1, 2, 3, 4 S.||Sacral plexus|
A modified posterior approach to lumbar plexus block using a transverse ultrasound image and an approach from the lateral border of the transducer
Jan 01, 2010; We would like to report our experience with a modified posterior approach to lumbar plexus block. This technique uses a...