Timing and topography of nucleus magnocellularis innervation by the cochlear ganglion.

This series of experiments examined the arrival and organization of cochlear nerve axons in the primary auditory brainstem nucleus, nucleus magnocellularis (NM), of the chick. DiI and DiD were injected into the cochlear nerve, cochlear ganglion, and basilar papilla (i.e.

Class III beta-tubulin expression in sensory and nonsensory regions of the developing avian inner ear.

A previous study showed that class III beta-tubulin, a widely used neuron-specific marker, is expressed in mature and regenerating hair cells but not the support cells of the avian inner ear. We investigated the expression of this marker in the developing avian inner ear. We found that class III beta-tubulin is not neuron-specific in the avian embryo, but appears to accumulate in neuronal cell types, including hair cells, about the time of their differentiation.

Long-term retention of a peripherally induced flexor reflex alteration in rats.

The long-term nature of peripherally induced spinal fixation was examined in the present study. Sixty-three anesthetized rats received 45-90 min of hindlimb stimulation. After a 24-72 h waiting period, the animals were given a midthoracic spinal section and hindlimb asymmetry was assessed.