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1st sacral spinal nerve (S1)

Function: - plantar flexion of foot - sensory lateral foot, posterior leg Physical examination: - walking on toes test motor function at S1 - the ankle jerk tests motor function at S1 - light touch in the lateral foot tests sensory function at S1. Innervation: 1) foot evertors 2) gastrocnemius Pathology: Referred pain: [2] 1) L5 & S1 -> lateral or posterior calf 2) S1 -> heel & lateral foot

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dermatome myotome

General

sacral spinal nerve

References

  1. Medical Knowledge Self Assessment Program (MKSAP) 11, 18. American College of Physicians, Philadelphia 1998, 2018
  2. Harrison's Principles of Internal Medicine, 13th ed. Isselbacher et al (eds), McGraw-Hill Inc. NY, 1994, pg 73-74
  3. Geriatrics at your Fingertips, 21st edition, 2019 Reuben DB et al (eds) American Geriatric Society ISSNL 1553-152X, ISBN 978-1-886775-62-6

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