Reflexes of Spinal Cord and Conus Medullaris


Reflex

Location of Lesion

Stimulus Normal Response Abnormal Response
Bahinski Upper motor neuron Stroking the plantar aspect of foot proximal lateral to distal medial Toes plantar flex Toes extend and splay
Oppenheim Upper motor neuron Rubbing the tibial crest proximal to distal Toes plantar flex Toes extend and splay
Cremasteric T12-L1 Stroking the tibial crest proximal to distal Upward motion of the No motion of the scrotum
Anal wink S2-S4 Stroking skin around anus Anal sphincter contracts No anal sphincter contraction
Bulbocavernosus S3-S4 Squeezing the penis in males, applying pressure to clitoris in females, or tugging the bladder catheter in either Anal sphincter contracts

No anal sphincter contraction


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  1. [...] by hypotension [decrease in blood pressure] and bradycardia [decrease in heart rate]. An absent bulbocavernosus reflex in a trauma victim can indicate spinal shock. The prognosis for the potential of neurologic [...]

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