Nerve-mediated responses of the rabbit urethral smooth muscles were st
udied using electrical stimuli of short duration to selectively stimul
ate the intramural nerves. The nature of the responses to exogenously
applied adrenergic agonists and its antagonists were also examined. Th
e results confirmed that the rabbit urethral smooth muscle contains bo
th subtypes of alpha-adrenoceptors and the nerve-mediated contraction
of the rabbit urethra is of adrenergic nature and mediated mainly via
al-adrenoceptors [1].