American   Academy   f   Manual   Medicine

 

Home      Pain referral      Trigger points      Cranial nerve      Spinal nerve      Historical

 

Spinal nerve supply of the sacro-coccygeal region


 

SPINAL NERVE SEGMENT

PLEXUS

INNERVATION OF MUSCLE & VISCERA

 

DERMATOME PATTERN

 

S1

SACRAL

Gluteus Maximus, Medius & Minimus; Piriformis; Superior & Inferior Gemelli; Obturator Internus; Rectus Femoris; Vastus Lateralis; Vastus intermedius; Vastus Medialis; Biceps Femoris; Semitendinosus; Semimembranosus; Tibialis Posterior; Peroneus Tertius; Extensor Digitorum Longus & Brevis; Extensor Hallucis Longus; Peroneus Longus & Brevis; Gastrocnemius; Soleus; Plantaris; Popliteus; Flexor Digitorum Longus & Brevis; Flexor Hallucis Longus & Brevis; Abductor Hallucis; Abductor Digiti Minimi; Quadratus Plantae; Flexor Digiti Minimi Brevis; Dorsal Interossei; Plantar Interossei

Traverses posteriorly from S1 into the buttocks, posterior aspect of thigh, leg & heel also involving the area of the lateral aspect of the heel, foot & little toe.

S2

SACRAL

Levator Ani; Coccygeus; Transversus Perinei Superficialis; Bulbocavernosus; Ischiocavernosus; Transverse Perinei Profundus; Sphincter Urethra; Sphincter Ani Externus; Piriformis; Gluteus Maximus; Biceps Femoris; Gastrocnemius; Soleus; Plantaris; Popliteus: Flexor Digitorum Longus; Flexor Hallucis Longus & Brevis; Abductor Hallucis; Abductor Digiti Minimi; Quadratus Plantae; Flexor Digiti Minimi Brevis; Dorsal Interossei;  Plantar Interossei

Traverses posteriorly from S2 through the gluteal cleavage sweeping slightly medial beneath the gluteal cleft at which time it traverses inferiorly down the medial aspect of the thigh, leg, ankle, and heel & terminates in the arch of the foot. Anteriorly, in males, the root of the penis as well as approximately 2/3 of the proximal shaft. In females, external genitalia.

S3

SACRAL

Levator Ani; Coccygeus; Transversus Perinei Superficialis; Bulbocavernosus; Ischiocavernosus; Transversus Perinei Profundus; Sphincter Ani Externus

Posteriorly affects the perianal region, anteriorly in males the distal 1/3 of the shaft, glands penis and urethral meatus. In females, the internal genitalia are innervated.

S4

SACRAL AND COCCYGEAL

Levator Ani; Coccygeus; Transversus Perinei Superficialis; Bulbocavernosus; Ischiocavernosus; Transversus Perinei Profundus; Sphincter Urethra; Sphincter Ani

Seems to be limited to the anal region

S5

COCCYGEAL

Levator Ani; Coccygeus; Transversus Perinei Superficialis; Bulbocavernosus; Ischiocavernosus; Transversus Perinei Profundus; Sphincter Urethra; Sphincter Ani;

Appears to be limited to the anus & rectum.

COCCYX

COCCYGEAL

Levator Ani; Coccygeus; Transversus Perinei Superficialis; Bulbocavernosus; Ischiocavernosus; Transversus Perinei Profundus; Sphincter Urethra; Sphincter Ani

Appears to be limited to the anus & rectum.

 

Back to Top



 

About us          Contact us

Copyright American Academy of Manual Medicine, Inc. 2001, 2007, 2008. All rights reserved.