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In [[anatomy]], a '''ganglion''' (plural '''ganglia''') is a [[biological tissue]] mass in the [[nervous system]]. It is a group of [[neuron|nerve cells]] which act as a [[wikt:junction|junction]] between different parts of the nervous system.<ref> ''Dorland's Medical Dictionary''</ref> |
In [[anatomy]], a '''ganglion''' (plural '''ganglia''') is a [[biological tissue]] mass in the [[nervous system]]. It is a group of [[neuron|nerve cells]] which act as a [[wikt:junction|junction]] between different parts of the [[nervous system]].<ref> ''Dorland's Medical Dictionary''</ref> |
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With [[invertebrate]]s, ganglia often do the work of a [[brain]]. In these cases, like the [[earthworm]], there is a ganglion above the [[gut]] at the front. This is linked to another under the gut by [[nerve fibre]]s running down each side of the gut. The rest of the central nervous system runs under the gut. This type of arrangement in found in a number of invertebrate [[phyla]], and contrasts with the [[vertebrate]]s, who have their [[spinal cord]] above ([[dorsal]] to) their gut. |
With [[invertebrate]]s, ganglia often do the work of a [[brain]]. In these cases, like the [[earthworm]], there is a ganglion above the [[gut]] at the front. This is linked to another under the gut by [[nerve fibre]]s running down each side of the gut. The rest of the central nervous system runs under the gut. This type of arrangement in found in a number of invertebrate [[phyla]], and contrasts with the [[vertebrate]]s, who have their [[spinal cord]] above ([[dorsal]] to) their gut. |
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Revision as of 06:59, 23 September 2014
In anatomy, a ganglion (plural ganglia) is a biological tissue mass in the nervous system. It is a group of nerve cells which act as a junction between different parts of the nervous system.[1]
With invertebrates, ganglia often do the work of a brain. In these cases, like the earthworm, there is a ganglion above the gut at the front. This is linked to another under the gut by nerve fibres running down each side of the gut. The rest of the central nervous system runs under the gut. This type of arrangement in found in a number of invertebrate phyla, and contrasts with the vertebrates, who have their spinal cord above (dorsal to) their gut.
In another usage, ganglion cells are found in the retina of the vertebrate eye.
References
- ↑ Dorland's Medical Dictionary