QuestionSBA
QuestionChoice
The upper anterior thigh and lateral thigh corresponds to the L2 dermatome. If the patient had reduced sensation in this area we would expect it to be associated with weakness in the L2 myotome which is hip flexion. This is not the pattern of motor dysfunction seen.
10007749
e
Upper anterior thigh and lateral thigh
QuestionChoice
The lateral calf correspond to the L5 dermatome. If the patient had reduced sensation in this area we would expect it to be associated with weakness in the L5 myotome which is great toe extension. This is not the pattern of motor dysfunction seen.
10007748
d
Lateral calf
QuestionChoice
This patient has experienced a paracentral disc herniation, where the traversing nerve root (the spinal nerve root which exits below the level of the intervertebral disc) is compressed. On examination, the patient is found to have weakness of ankle plantarflexion, which corresponds to the S1 myotome. This suggests compression of the S1 spinal nerve route. Since spinal nerves carry general sensory information from the upper limb, the patient is likely to have reduced sensation of the S1 dermatome. This corresponds to the lateral border of the foot and the sole of the foot.
10007745
a
Lateral border and sole of the foot
QuestionChoice
The medial leg and medial ankle correspond to the L4 dermatome. If the patient had reduced sensation in this area, the patient would have weakness in the L4 myotome which is ankle dorsiflexion.
10007746
b
Medial calf and medial ankle
QuestionChoice
The anterior knee and medial thigh corresponds to the L3 dermatome. If the patient had reduced sensation in this area we would expect it to be associated with weakness in the L3 myotome which is knee extension. This is not the pattern of motor dysfunction seen.
10007747
c
Anterior knee and medial thigh
Concept
Chapter
2693
3780
Dermatomes
Topic
141
Neurology
14096
Picture
1518
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Topic
141
Neurology
A 55-year-old man presents to A&E with severe lower back pain. A sagittal MRI of the lumbar spine is taken, and he is diagnosed with a paracentral disc herniation of the lumbar spine [lightgallery]. On examination, the patient is found to have weakness of ankle plantarflexion on the right-hand side and reduced sensation in a specific area of the lower limb.

Which of the following regions of the lower limb would be expected to show reduced sensation?
a