<prompt> Which of the following structures is involved in the paramedian infarction of the base of the pons?Anterior spinocerebellar tractDescending trigeminal tractPyramidal tractRubrospinal tract  <response>: Base of the pons includes coicospinal pyramidal, coicobulbar, coicopontine tracts, pontine nuclei, and transverse pontine fibers. so in paramedian infarction of base of pons coicospinal pyramidal tract is affected. 