Which spinal nerve dermatome corresponds to sensory disturbances such as numbness or tingling over the lateral side of the foot and the little toe?
Solution
Correct Answer: Option B
The correct answer is S1.
- The S1 dermatome is responsible for the sensory innervation of the lateral side of the foot and the little toe.
- Patients experiencing sensory disturbances such as numbness, tingling, or burning sensations in this area are likely to have involvement of the S1 spinal nerve.
Here are some key points to understand:
- L4 dermatome: Typically covers the medial aspect of the leg and foot.
- L5 dermatome: Usually covers the dorsum of the foot, especially the middle three toes (second to fourth toes).
- S1 dermatome: Covers the lateral side of the foot and the little toe, making it the primary candidate in this scenario.
- S2 dermatome: Involves the posterior thigh and upper calf but does not extend to the foot.
Understanding dermatome distributions is essential for localizing spinal nerve lesions based on sensory symptoms.
Reference: Gray's Anatomy, 42nd Edition, Section on Spinal Nerve Dermatomes, Chapter 6, Page 756
- The S1 dermatome is responsible for the sensory innervation of the lateral side of the foot and the little toe.
- Patients experiencing sensory disturbances such as numbness, tingling, or burning sensations in this area are likely to have involvement of the S1 spinal nerve.
Here are some key points to understand:
- L4 dermatome: Typically covers the medial aspect of the leg and foot.
- L5 dermatome: Usually covers the dorsum of the foot, especially the middle three toes (second to fourth toes).
- S1 dermatome: Covers the lateral side of the foot and the little toe, making it the primary candidate in this scenario.
- S2 dermatome: Involves the posterior thigh and upper calf but does not extend to the foot.
Understanding dermatome distributions is essential for localizing spinal nerve lesions based on sensory symptoms.
Reference: Gray's Anatomy, 42nd Edition, Section on Spinal Nerve Dermatomes, Chapter 6, Page 756
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