Which test involves rubbing a fingernail along the tibial crest?

The test that involves rubbing a fingernail along the tibial crest is Oppenheim's test. This neurological assessment is used to evaluate the integrity of the corticospinal tract. During the test, the examiner uses a dull object, typically a fingernail, to apply pressure and glide along the anterior tibial crest, observing for any reflexive responses in the great toe. A positive response, which usually involves the great toe extending or showing other involuntary movements, suggests that there may be damage to the upper motor neurons.

Understanding the Oppenheim's test is critical, as it specifically assesses the reflexes associated with the pathways that control voluntary motor function. This is particularly relevant in clinical settings to diagnose conditions affecting upper motor neuron function and can aid in identifying neurological disorders.