File:Functional unit of callosal influence.jpg
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Functional unit of callosal influence
Summary[edit]
| Description |
English: The principal functional unit of callosal influence comprises a facilitatory centre and a depressing peripheral zone, that together shape the influence of converging inputs to pyramidal neurons. This organisation serves to sculpt and focus the output of neural circuits. In this schematic, cells that generate excitatory postsynaptic potentials (EPSPs) are represented in black. Callosal projections (excitatory) are represented in cyan. Inhibitory interneurons are represented in red. An inhibitory influence upon pyramidal tract cells in the surround region of the opposite hemisphere may arise from either local feed-forward inhibitory circuits or recurrent inhibitory circuits. Although the patterns of inhibition elicited by callosal projections are in part an emergent property of these local networks, the actuating excitatory drive (from the opposite hemisphere) is necessarily also selective and highly differentiated. A key assumption is that such inter-hemispheric interactions are reciprocal, and thus integrative.
The original artwork contains elements derived from the following sources: https://upload.wikimedia.org/wikipedia/commons/f/f3/Muscle_fascicles_and_cells.png; https://commons.wikimedia.org/wiki/File:Corpus_callosum.gif. |
| Date | |
| Source | Own work |
| Author | Rgcarson |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:40, 31 May 2020 | | 4,763 × 4,096 (5.05 MB) | Rgcarson (talk | contribs) | Magnifying glass removed; corticospinal tract relationship to spinal cord clarified; annotations added |
| 12:03, 3 May 2020 |  | 4,529 × 4,686 (3.87 MB) | Rgcarson (talk | contribs) | Uploaded own work with UploadWizard |
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