- Magnocellular cell
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Not to be confused with Magnocellular neurosecretory cell.This article is about the lateral geniculate nucleus cell. For the part of the red nucleus, see Magnocellular red nucleus.
Neuron: Magnocellular cell NeuroLex ID nifext_42 Magnocellular cells, also called M-cells, are neurons located within the magnocellular layer of the lateral geniculate nucleus of the thalamus. The cells are part of the visual system. They are termed "magnocellular" since they are characterized by their relatively large size compared to parvocellular cells.
Contents
Visual system
Schematic diagram of the primate LGN.
Magnocellular cells are primarily concerned with visual perception.[1] In particular these cells are responsible for resolving motion and coarse outlines. The M-cells receive their information from the axons of parasol cells exiting the optic tract. The M-cells are large, fast-conducting neurons with their cell bodies located in the 2 ventral magnocellular layers of the lateral geniculate nucleus. The information they carry is sent through the optic radiations to the visual cortices, possibly after editing and gating by visual cortex exerting top-down control. The M-cells feed more to the parietal cortices, in the dorsal "where" stream, than the temporal cortices, destination of the ventral "what" stream. This is consistent with their coding of movement and edges as opposed to fine detail. This system of cells operates with great speed at the expense of detail.
See also
- Parvocellular cell
- Koniocellular cell
References
- ^ Xu X, Ichida JM, Allison JD, Boyd JD, Bonds AB, Casagrande VA (February 2001). "A comparison of koniocellular, magnocellular and parvocellular receptive field properties in the lateral geniculate nucleus of the owl monkey (Aotus trivirgatus)". J. Physiol. (Lond.) 531 (Pt 1): 203–18. PMC 2278453. PMID 11179404. http://www.jphysiol.org/cgi/pmidlookup?view=long&pmid=11179404.
External links
Sensory system: Visual system and eye movement pathways Visual perception 1° (Bipolar cell of Retina) → 2° (Ganglionic cell) → 3° (Optic nerve → Optic chiasm → Optic tract → LGN of Thalamus) → 4° (Optic radiation → Cuneus and Lingual gyrus of Visual cortex → Blobs → Globs)Muscles of orbit TrackingHorizontal gazeVertical gazePupillary reflex Pupillary dilation1° (Posterior hypothalamus → Ciliospinal center) → 2° (Superior cervical ganglion) → 3° (Sympathetic root of ciliary ganglion → Nasociliary nerve → Long ciliary nerves → Iris dilator muscle)1° (Retina → Optic nerve → Optic chiasm → Optic tract → Visual cortex → Brodmann area 19 → Pretectal area) → 2° (Edinger-Westphal nucleus) → 3° (Short ciliary nerves → Ciliary ganglion → Ciliary muscle)Circadian rhythm M: EYE
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Human cell types / list derived primarily from ectoderm Surface ectoderm Trichocyte · KeratinocyteNeural crest glia: Schwann cell · Satellite glial cellDigestive systemNeural tube Categories:- Histology
- Visual system
- Neuroscience stubs
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