C M Bowe

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1. Intraaxonal recordings were obtained in vitro from the sural nerve (SN), the muscle branch of the anterior tibial nerve (ATN), or the deafferented ATN (dATN) in 5- to 7-wk-old rats. Whole-nerve sucrose gap recordings were obtained from the SN and the ATN. This allowed study of cutaneous (SN), mixed motor and muscle afferent (ATN), and isolated muscle(More)
Differences in potassium channel organization between motor and sensory fibres have been described in amphibians but have not previously been examined in mammals. In the present investigation, we studied whole nerve and single axon responses following pharmacological blockade of potassium conductance in rat ventral and dorsal spinal roots during maturation.(More)
Excitability properties of isolated frog and rat sciatic nerve fibers were examined using intra-axonal and sucrose-gap recording techniques. Paired stimulation experiments on rat myelinated fibers indicate that a small proportion (11%; n = 84) of these axons demonstrate decreased threshold indicative of a supernormal period. In contrast, 81% (n = 23) of(More)
OBJECTIVE To provide clinical, electrophysiologic, and ultrastructural findings in three patients with a presynaptic congenital myasthenic syndrome (CMS). BACKGROUND Familial infantile myasthenia and paucity of synaptic vesicles are the only two fully characterized CMS. We are describing here three patients with another form of presynaptic CMS(More)
While the postnatal length growth of the largest internodes in the rat sural nerve (SN) is proportional to nerve elongation, in the developing inferior alveolar nerve (IAN), early postnatal myelin sheath remodelling allows internodal lengthening to exceed the growth rate of the whole nerve. To assess the functional consequences of ongoing myelin sheath(More)
Electrophysiological properties of regenerated sciatic nerves were examined in vitro following sciatic crush lesions performed on rats at 1 week to 4 months of age. Pharmacological blockade of potassium channels with 4-aminopyridine (4-AP) in control nerves resulted in only minimal changes in the waveform of whole nerve responses, but was associated with(More)
The selective response of demyelinated sensory fibers to 4-aminopyridine (4-AP) has been proposed as a mechanism underlying the reported paresthesias that complicate the use of this potassium-channel blocking agent in clinical trials for the treatment of multiple sclerosis and neuromuscular disorders. To identify differences in the electrophysiological(More)
The relation between internodal length (L) and fibre diameter (D) was examined light microscopically in teased specimens from normal developing rat sciatic nerves, and from rat sciatic nerves which had regenerated following crush lesions at various postnatal ages. In newborn rat pups virtually all sciatic nerve axons are unmyelinated and myelination is an(More)
Mammalian motor and sensory fibers respond differently to the potassium channel-blocking agent, 4-aminopyridine (4-AP). The action potentials of the motor fibers increase in duration after 4-AP, while the sensory fibers respond with bursts of action potentials after a single stimulus. These differences may account for the paresthesias reported by patients(More)