Which spinal nerve dermatome corresponds to sensation over the front of the thigh and knee?
Solution
Correct Answer: Option B
The spinal nerve dermatome that corresponds to sensation over the front of the thigh and knee is primarily L3.
- The dermatomes are areas of skin innervated by the sensory fibers of a single spinal nerve root.
- The L2 dermatome covers the upper anterior thigh region, but sensation over the anteromedial aspect of the thigh and knee predominantly involves the L3 nerve root.
- The L4 dermatome mainly covers the medial leg and the medial malleolus, rather than the front of the thigh or knee.
- The S1 dermatome is associated with sensation over the lateral and plantar aspect of the foot and the posterior leg, not the anterior thigh or knee.
Therefore, the correct dermatome for sensation over the front of the thigh and knee is L3.
Reference: Gray's Anatomy, 41st Edition, Volume 1, Chapter: The Spinal Cord and Spinal Nerves / Dermatomes, p. 1109
- The dermatomes are areas of skin innervated by the sensory fibers of a single spinal nerve root.
- The L2 dermatome covers the upper anterior thigh region, but sensation over the anteromedial aspect of the thigh and knee predominantly involves the L3 nerve root.
- The L4 dermatome mainly covers the medial leg and the medial malleolus, rather than the front of the thigh or knee.
- The S1 dermatome is associated with sensation over the lateral and plantar aspect of the foot and the posterior leg, not the anterior thigh or knee.
Therefore, the correct dermatome for sensation over the front of the thigh and knee is L3.
Reference: Gray's Anatomy, 41st Edition, Volume 1, Chapter: The Spinal Cord and Spinal Nerves / Dermatomes, p. 1109
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