Words similar to pyramidal
Example sentences for: pyramidal
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The variation in neuron-packing density with volume contrasts somewhat with the report of Abusaad and colleagues [ 36], who found no significant differences (P = .06) in neuronal packing density in the dentate gyrus cell layers of the hippocampus among the three mouse strains that they examined, but did see a significant difference in the pyramidal cell layers.
The γ frequency oscillations (30-100 Hz) are characteristic of responses to sensory input measured by cortical EEG [ 9 ] . In the hippocampal slice preparation, γ oscillations can be evoked by brief, high frequency tetanic stimuli to region CA1 [ 10 11 12 13 ] . The extracellular field potential response during these oscillations takes the form of a train of population spikes in stratum pyramidal at γ and β (15-30 Hz) frequencies [ 14 ] . Intracellular recordings during γ oscillations induced by tetanic stimulation reveal a slow membrane depolarization in conjunction with GABA A receptor-mediated inhibitory postsynaptic potentials [ 11 15 ] . This synaptic inhibition-based γ activity entrains action potential generation in pyramidal neurons, leading to the population spikes at γ band frequencies.
The volume of the granule cell layer of the dentate gyrus varies as much as 40-80% among different inbred strains of mice [ 33 34 35 ] . More recent experiments using stereologic techniques have reported substantial variation in both neuron number and volume of the pyramidal and dentate cell layers of the hippocampus [ 36].
Strongly positive nuclei were also present in the dentate gyrus and pyramidal cell layer of the hippocampus.
Thus, for example, in the former, we found NK-ir fibers in the superior colliculus, the restiform body, the pyramidal tract, and in the pontine nuclei, in which in the cat no immunoreactive fibers were found [ 15 ] . Comparing the distribution of cell bodies containing NK in both cat and human brainstems, it seems that the distribution is widespread in the feline (see [ 15 ] ). In both species NK-ir perikarya were found in the periaqueductal gray and in the inferior colliculus.
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