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Related Concept Videos

Local Anesthetics: Clinical Application as Spinal Anesthesia01:11

Local Anesthetics: Clinical Application as Spinal Anesthesia

Spinal anesthetics are given during lower abdomen and limb surgeries to block sensory and motor neurons. They are administered in the mid to low lumbar regions, primarily acting on the cauda equina's nerve roots. The blockade level depends on the local anesthetic (LA) concentration. Usually, low LA concentrations are sufficient to block sensory fibers, while only high LA concentrations block motor fibers. Other factors like injection volume and speed, the patient's posture, and the drug...
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The plexuses of the lower body include the lumbar, sacral, and coccygeal plexuses, which innervate the abdomen, pelvis, legs, and coccygeal region. These plexuses control the transmission of sensory information and coordinate motor functions of the lower body.
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Related Experiment Video

Updated: Jul 7, 2026

Efficacy of Fu's Subcutaneous Needling on Sciatic Nerve Pain: Behavioral and Electrophysiological Changes in a Chronic Constriction Injury Rat Model
08:20

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Does sciatic parasacral injection spread to the obturator nerve? An anatomic study.

Nathalie Valade1, Jacques Ripart, Emmanuel Nouvellon

  • 1Division Anesthésie-Douleur-Urgence-Réanimation, Groupe Hospitalier Universitaire Caremeau, Nimes, France.

Anesthesia and Analgesia
|January 30, 2008
PubMed
Summary

Parasacral sciatic nerve block consistently spreads to the obturator nerve and sacral roots. This anatomical study suggests it can provide both obturator and perineal blockade, potentially simplifying anesthesia.

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Area of Science:

  • Anatomy
  • Regional Anesthesia
  • Surgical Procedures

Background:

  • The efficacy of parasacral sciatic nerve block for obturator nerve and perineal blockade is not well-established.
  • Anatomical variations may influence the success of regional anesthesia techniques.

Purpose of the Study:

  • To anatomically assess the spread of a parasacral injection.
  • To determine if parasacral injection reaches the obturator nerve and sacral nerve roots.

Main Methods:

  • Bilateral parasacral injections were performed on seven human cadavers using colored latex.
  • Dissections evaluated dye spread to the sciatic nerve, obturator nerve, and sacral roots (S1-3).

Main Results:

  • Out of 14 injections, 11 were successful parasacral blocks.
  • 82% of successful injections demonstrated dye spread to the obturator nerve and sacral roots.

Conclusions:

  • Successful parasacral injections consistently achieve spread to the obturator nerve and sacral roots.
  • Parasacral block may provide both obturator and perineal blockade, potentially negating the need for a separate obturator nerve block.
  • Further clinical studies are recommended to validate these anatomical findings.