perikaryon


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perikaryon

[¦per·ə′kar·ē‚än]
(cell and molecular biology)
A cytoplasmic mass surrounding a nucleus.
(neuroscience)
The body of a nerve cell, containing the nucleus.
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We detected extracellular diffuse A[Beta] deposits in 4 brains, and in 3 of these brains there were subtle punctate A[Beta] deposits in the neuronal perikaryon.
In the histological sections of both the treated and control groups the large multi -polar neurons were dispersed among the neuroglial cells and were characterized by numerous processes extending in different directions from the perikaryon or the cell body (Fig.
Located within the epidermis and in the fibrous capsules surrounding the internal organs, chromatosomes consist of 2 to 12 uninuclear chromatophores, which are irregular cells constituted by a perikaryon and one or two peripherally ramified cell extensions through which the pigment granules translocate (McNamara, 1981).
PV+ immunoreactive neurons were intensely stained throughout the perikaryon and cell processes in all experimental animals.
Because this biochemical change could represent either a larger perikaryon or more neuritic extensions, we also assessed membrane protein markers in both absolute (membrane protein concentration) and relative (membrane/total protein) terms; an increase in extensions would augment membrane protein proportionally more than total protein.
Beginning on day 5, however, neuronal degeneration was seen in many areas, manifested by shrinkage of the perikaryon with intense eosinophilia of the cytoplasm, central chromatolysis, and condensation of the nucleus.
A 90-degree clockwise rotation of this confocal stack shows that the perikaryon of this neuron is closer to the surface of the foot than the immunoreactive organelles associated with the ciliary cells (Fig.
However, if we assume an "ideal" two-dimensional chromatophore as being 20 [micro]m wide across the perikaryon, allowing for a 10-[micro]m diameter nucleus, with a cell extension length of 100 [micro]m, and being roughly triangular in form, as defined by McNamara (1980) for a monochromatic shrimp chromatophore, further calculation allows expression of the ratio in meaningful units: RPCH-induced, rapid-phase aggregation 13.
One perikaryon (pp) was positioned toward the posterior margin of the buccal mass and appeared to receive innervation from neurites that exited the pleural ganglion (Figs.
Type T photoreceptors are characterized by a flat perikaryon (Fig.
The present study focuses particularly on the ultrastructure of the flange and perikaryon regions of the pillar cells, which form the principal epithelial barrier between the hemolymph and the external medium.