ABSTRACT
To study the possibility of interactions between buccal cutaneous sensory receptors and voluntary maximum isometric contractions of the masseter muscles, six adult subjects exercised maximum teeth clenching before and after spraying the right cheek surface with aerosol containing 20% benzocaine. The right cheek and masseter muscle served as the experimental side, the left cheek and masseter muscle as the control side. Isometric motor outputs, on the right and left sides, were monitored by integrated surface electromyography over periods of 10 seconds. Topical surface anesthesia provided no evidence of motor modulation by cutaneous tactile receptors. Before and after anesthesia, the two muscles showed nearly identical and well-coordinated motor innervation patterns. It is suggested that the cortical motor commands of maximum isometric contractions, with recruitment of practically all available motor units, overrule all modulatory inputs except those of fatigue.
Subject(s)
Anesthesia, Local , Cheek/innervation , Isometric Contraction , Masseter Muscle/physiology , Masticatory Muscles/physiology , Muscle Contraction , Sensory Receptor Cells/physiology , Adult , Benzocaine , Dental Occlusion, Centric , Electromyography , Female , Humans , Male , Motor Neurons/drug effects , Motor Neurons/physiology , Sensory Receptor Cells/drug effectsABSTRACT
The occurrence of a urethrocavernous fistula after creation of a cavernospongiosum shunt for priapism is rare. We report a case in which the fistula, likely the sequela of traumatic urethral catheterization, occurred 3 months after establishment of the shunt.
