Biology:Cortical patterning
Cortical patterning is a field of developmental neuroscience which aims to determine how the various functional areas of the cerebral cortex are generated, what size and shape they will be, and how their spatial pattern across the surface of the cortex is specified. Early brain lesion studies indicated that different parts of the cortex served different cognitive functions, such as visual, somatosensory, and motor functions, beautifully assimilated by Brodmann in 1909.[1] Today the field supports the idea of a 'protomap', which is a molecular pre-pattern of the cortical areas during early embryonic stages.[2] The protomap is a feature of the cortical ventricular zone, which contains the primary stem cells of the cortex known as radial glial cells. A system of signaling centers, positioned strategically at the midline and edges of the cortex, produce secreted signaling proteins that establish concentration gradients in the cortical primordium.[3][4][5] This provides positional information for each stem cell, and regulates proliferation, neurogenesis, and areal identity. After the initial establishment of areal identity, axons from the developing thalamus arrive at their correct cortical areal destination through the process of axon guidance and begin to form synapses. Many activity-dependent processes are then thought to play important roles in the maturation of each area.[6]
See also
- Protomap
- Radial unit hypothesis
- Neural stem cell
- Stem cell
- Neurogenesis
- Cellular differentiation
- Gyrification
References
- ↑ notes, Dr. K. Brodmann; translated with editorial; Garey, an introduction by Laurence J. (2006). Brodmann's Localisation in the cerebral cortex : the principles of comparative localisation in the cerebral cortex based on cytoarchitectonics. (3rd ed.). New York: Springer Science+Business Media. ISBN 978-0387269177.
- ↑ Rakic, P (8 July 1988). "Specification of cerebral cortical areas.". Science 241 (4862): 170–6. doi:10.1126/science.3291116. PMID 3291116.
- ↑ Fukuchi-Shimogori, T; Grove, EA (2 November 2001). "Neocortex patterning by the secreted signaling molecule FGF8.". Science 294 (5544): 1071–4. doi:10.1126/science.1064252. PMID 11567107.
- ↑ Grove, EA; Fukuchi-Shimogori, T (2003). "Generating the cerebral cortical area map.". Annual Review of Neuroscience 26: 355–80. doi:10.1146/annurev.neuro.26.041002.131137. PMID 14527269.
- ↑ Sur, M; Rubenstein, JL (4 November 2005). "Patterning and plasticity of the cerebral cortex.". Science 310 (5749): 805–10. doi:10.1126/science.1112070. PMID 16272112.
- ↑ Ackman, JB; Burbridge, TJ; Crair, MC (11 October 2012). "Retinal waves coordinate patterned activity throughout the developing visual system.". Nature 490 (7419): 219–25. doi:10.1038/nature11529. PMID 23060192.
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