Adduction of the digits is controlled by S2 and S3.
In an unconscious patient, both somatic sensory and somatic motor functions of spinal cord levels can be tested using tendon reflexes:
A tap on the patellar ligament at the knee tests predominantly L3 and L4.
A tendon tap on the calcaneal tendon posterior to the ankle (tendon of gastrocnemius and soleus) tests S1 and S2.