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Spinal nerve supply of the lumbar region


 

SPINAL NERVE SEGMENT

PLEXUS

INNERVATION OF MUSCLE & VISCERIA

 

DERMATOME PATTERN

 

L1

LUMBAR

External Obliques; Internal Obliques; Transverse Abdominis; Cremaster; Rectus Abdominis; Quadratus Lumborum; Iliopsoas; Iliacus; Ileocecal Valve; Large Intestine

Traverses posteriorly & inferiorly from L1 to affect the pubic, medial thigh and groin regions.

L2

LUMBAR

External Obliques; Internal Obliques; Transverse Abdominis; Cremaster; Rectus Abdominis; Quadratus Lumborum; Iliacus; Psoas Major & Minor; Sartorius; Rectus Femoris; Vastus Lateralis; Vastus Intermedius; Vastus Medialis;  Adductor Longus & Brevis; Pectineus; Gracilis; Female Reproductive System;  Appendix

Traverses posteriorly from L2 above the buttocks inferiorly down the lateral aspect of the mid-thigh at which time it traverses anteriorly & inferiorly to the medial aspect of the mid-thigh.

L3

LUMBAR

Transverse Abdominis; Cremaster; Rectus Abdominis; Quadratus Lumborum; Iliacus; Psoas Major & Minor;  Sartorius; Rectus Femoris; Vastus Lateralis; Vastus Intermedius; Vastus Medialis; Pectineus; Adductor Longus & Brevis; Adductor magnus; Gracilis; Obturator Externus; Urinary Bladder; Female & Male Reproductive System

Traverses posteriorly from L3 across the superior aspect of the buttocks & inferiorly down the lateral & distal aspect of the thigh, at which time it traverses anteriorly & inferiorly to the medial aspect of the distal thigh at the knee.

L4

LUMBAR-SACRAL

Transverse Abdominis; Cremaster; Rectus Abdominis; Obturator Externus; Gluteus Maximus, Medius & Minimus; Superior & Inferior Gemelli; Adductor Brevis; Adductor Magnus; Gracilis; Tensor Fasciae Latae; Rectus Femoris; Vastus Lateralis; Vastus Intermedius;  Vastus Medialis;  Biceps Femoris; Semimembranosus; Semitendinosus; Tibialis Anterior; Peroneus Tertius; Extensor Digitorum Longus & Brevis; Extensor Hallucis Longus; Prostate Gland

Traverses posteriorly from L4 through the buttocks and the entire length of the lateral aspect of the thigh; at which time it traverses anteriorly and slightly inferiorly beneath the patella to the medial aspect of the leg whereby it traverses inferiorly through the medial malleolus and into the great toe as well as the plantar surface of the great toe.

L5

SACRAL

Gluteus Maximus, Medius & Minimus; Tensor Fasciae Latae; Obturator Internus; Superior & Inferior Gemelli; Rectus Femoris; Vastus Lateralis; Vastus Intermedius; Vastus Medialis; Biceps Femoris; Semitendinosus; Semimembranosus; Tibialis Anterior; Extensor Hallucis Longus; Extensor Digitorum Longus & Brevis; Peroneus Tertius; Peroneus Longus & Brevis; Gastrocnemius; Soleus; Plantaris; Popliteus; Flexor Hallucis Longus & Brevis;  Flexor Digitorum Longus & Brevis; Tibialis Posterior; Dorsal Interossei; Plantar Interossei; Perineum

Traverses posteriorly from L5 into the buttocks & inferiorly down the posterior lateral aspect of the thigh & proximal leg at which time it traverses anteriorly & inferiorly down the anterior aspect of the leg & medial dorsum of the foot.

 

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