ganglion
Noun
Meaning
A mass or knot of nervous matter, including nerve cells, usually forming an enlargement in the course of a nerve.
A node, or gland in the lymphatic system; as, a lymphatic ganglion.
A globular, hard, indolent tumor, situated somewhere on a tendon, and commonly formed by the effusion of a viscid fluid into it; -- called also weeping sinew.
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Because of this counter-intuitive arrangement, light must first pass through and around the ganglion cells and through the thickness of the retina, (including its capillary vessels, not shown) before reaching the rods and cones.
Between the ganglion cell layer and the rods and cones there are two layers of neuropils where synaptic contacts are made.
Despite the fact that all are nerve cells, only the retinal ganglion cells and few amacrine cells create action potentials.
Differentiation begins with the retinal ganglion cells and concludes with production of the Muller glia.
By binding to ganglion type nicotinic receptors in the adrenal medulla, nicotine increases flow of adrenaline (epinephrine), a stimulating hormone and neurotransmitter.
However, a lobster's brain operates from not one but several ganglia and disabling only the frontal ganglion does not usually result in death.