Virus-labeled neurons in the major pelvic ganglion A: Neurons labeled by virus injected into the bladder. B: Neurons labeled by virus injected into the prostate. C: Tyrosine hydroxylase-labeled neurons. In B and C, prostate neurons that are adrenergic are marked with arrows; prostate neurons that are not adrenergic are marked with arrowheads. Note that the prostate neurons are much larger than the bladder neurons. Bar: 100 μ.