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But in the monkey and human, many granule cells also have basal dendrites.
Distances between successive branch points are shorter for basal dendrites.
However, the number of terminal branches for both apical and basal dendrites appear to be similar.
As distance increases from the soma, the basal dendrites branch profusely.
The basal dendrites arise from the base of the pyramidal cell's soma.
The stratum oriens is the location between layers containing basal dendrites.
The basal dendrite however has approximately 3 fold fewer endings per primary dendrite.
Two types of dendrites present on pyramidal cells are apical and basal dendrites.
Proximal apical dendrites and basal dendrites have approximately the same density.
Basal dendrites have a shorter distance to the tips and a more restricted range than apical dendrites.
The apical dendrites and basal dendrites possess a radial organization pattern as they extend from the soma.
Other key structural features of the pyramidal cell are a single axon, a large apical dendrite, multiple basal dendrites, and the presence of dendritic spines.
Data suggests that proximal apical and basal dendrites are more compressed but offer a wider local range of activity than distal apical dendrites.
Injection of tetanus toxin into neonatal rats has shown that growth of apical dendrites occurs normally during signal deprivation while basal dendrite growth is restricted.
The basal dendrites of mitral cells are connected to interneurons known as granule cells, which by some theories produce lateral inhibition between mitral cells.
These perisomatic and basal dendrites project into all cortical layers, but most of their horizontal arbors populate layers V and VI, some reaching down into the white matter.
A basal dendrite is a dendrite that emerges from the base of a pyramidal cell that receives information from nearby neurons and passes it to the soma, or cell body.
Major G et al. (2008) Spatiotemporally Graded NMDA Spike/Plateau Potentials in Basal Dendrites of Neocortical Pyramidal Neurons.
There are also in the plexiform layer GABAergic synaptic connections between the apical dendrites of granular cells and the basal dendrites of the tufted cells and mitral cells.
T-type and R-type voltage-gated calcium channels have been found in basal dendrites, and it is thought that the activation of these channels during action potential bursts lead to the generation of dendritic calcium spikes.
Studies of dendritic morphological changes indicate that elevation of stress hormones in layer II-III of the prefrontal cortex causes no observable change in the structure or distribution of basal dendrites.
Between postnatal days 3 and 21, pyramidal cells have been shown to double in the size of the soma, increase in length of the apical dendrite by fivefold, and increase in basal dendrite length by thirteenfold.
The basal dendrites of pyramidal neurons are also found here, where they receive input from other pyramidal cells, septal fibers and commissural fibers from the contralateral hippocampus (usually recurrent connections, especially in CA3 and CA2.)
CA3 neurons in the tetanus toxin model of early onset epilepsy, however, show a reduction in the branching complexity of basal dendrites as well as a decrease in the spine density on both the apical dendrites and the basal dendrites.