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Modified Spared Nerve Injury Surgery Model of Neuropathic Pain in Mice

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Bilateral eventration of sciatic nerve.

T Sharma¹, R K Singla, M Lalit

¹Department of Anatomy, Govt. Medical College, Amritsar, Punjab, India.

JNMA; Journal of the Nepal Medical Association

|November 5, 2011

Summary

Anatomical variations in the sciatic nerve (SN) were observed during cadaver dissection, with distinct tibial and common peroneal nerve pathways. Understanding these sciatic nerve variations is crucial for diagnosing piriformis syndrome and improving surgical outcomes.

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Area of Science:

Anatomy
Neuroscience

Background:

The sciatic nerve (SN) is the largest nerve in the human body, originating from the sacral plexus.
Variations in the SN's anatomical course can lead to neurological symptoms and surgical complications.

Observation:

During dissection, the two divisions of the sciatic nerve were found to be separate in the gluteal region bilaterally.
The tibial nerve (TN) passed inferior to the piriformis muscle, while the common peroneal nerve (CPN) pierced it.

Findings:

The study identified an anomalous passage of the sciatic nerve divisions through or below the piriformis muscle.
This anatomical variation potentially predisposes nerves to compression, leading to conditions like piriformis syndrome.

Implications:

Knowledge of these sciatic nerve variations is vital for surgeons managing piriformis syndrome, a common cause of leg pain.
Abnormal SN pathways may also explain the high failure rate of popliteal nerve blocks.