Sciatic Nerve

Authors

Affiliations

Nate Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Cross-section of middle thigh¹: Sciatic nerve labeled the Ischiadic nerve

Roots

Pathway

Common Fibular Division

Motor innervation

Direct Branches

Muscle	Origin	Insertion	Innervation	Action
Biceps femoris long head	Ischial tuberosity Sacrotuberous lig. (Common head with semitendinosus)	Fibular head	Tibial n. L5 - S2	Hip: Extension Knee: Flexion, ER Pelvis: Sagittal stabilization
Semitendinosus	Ischial tuberosity Sacrotuberous lig. (common head with biceps femoris long head)	Pes anserine	Tibial n. L5 - S2	Hip: Extension Knee: Flexion, IR Pelvis: Sagittal stabilization

• Semitendinosus²
• Semimembranosus²
• Biceps femoris (long head)²
• Adductor magnus (medial part)²

Cutaneous Innervation

Dysfunction

Damage to the common fibular division during Total hip arthroplasty can result in drop foot

• Deep gluteal syndrome is an increasingly recognized disease entity, caused by compression of the sciatic or pudendal nerve due to non-discogenic pelvic lesions

Entrapment

Reading list

• Sciatic nerve p373³

References

1.

Gray H. Anatomy of the Human Body. 20th ed. (Lewis WH, ed.). Lea & Febiger; 1918. https://www.bartleby.com/107/

2.

Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.

3.

Kolar P. Clinical Rehabilitation. 1st ed. Dynamic Neurological Stabilization; 2014.