Supplementary motor area

Supplementary motor area
Some motor areas in the human cortex. The supplementary motor area is shown in pink.
3D visualization of the supplementary motor cortex in an average human brain
Identifiers
NeuroNames3176
FMA224858
Anatomical terms of neuroanatomy

The supplementary motor area (SMA) is a part of the motor cortex of primates that contributes to the control of movement. It is located on the midline surface of the hemisphere just in front of (anterior to) the primary motor cortex leg representation. In monkeys, the SMA contains a rough map of the body. In humans, the body map is not apparent. Neurons in the SMA project directly to the spinal cord and may play a role in the direct control of movement. Possible functions attributed to the SMA include the postural stabilization of the body, the coordination of both sides of the body such as during bimanual action, the control of movements that are internally generated rather than triggered by sensory events, and the control of sequences of movements. All of these proposed functions remain hypotheses. The precise role or roles of the SMA is not yet known.

For the discovery of the SMA and its relationship to other motor cortical areas, see the main article on the motor cortex.

Subregions

At least six areas are now recognized within the larger region once defined as the SMA. These subdivisions have been studied most extensively in the monkey brain. The most anterior portion is now commonly termed pre-SMA.[1][2][3] It has sparse or no connections to the spinal cord or the primary motor cortex and has extensive connectivity with prefrontal areas.[1][4][5][6][7]

The supplementary eye field (SEF) is a relatively anterior portion of the SMA that, when stimulated, evokes head and eye movements and perhaps movements of the limbs and torso.[8][9][10][11]

Dum and Strick[5] hypothesized on the basis of cytoarchitecture and connections to the spinal cord that the portion of SMA in the cingulate sulcus, on the medial part of the hemisphere, can be split into three separate areas, the cingulate motor areas. The functions of the cingulate motor areas have not yet been systematically studied, though may be involved in emotionally driven behaviours like the limbic laugh.

SMA proper in monkeys has now been confined to a region on the crown of the hemisphere and extending partly onto the medial wall, just anterior to the primary motor leg representation. SMA proper projects directly to the spinal cord and therefore is one of the primary output areas of the cortical motor system.[5][12][13][14][15][16]

Recently, Zhang et al.[17] investigated the functional subdivisions of the medial SFC on the basis of whole-brain connectivity characterized from a large resting-state fMRI data set. Other than replicating the boundaries between SMA and preSMA, the current results support a functional difference between the posterior and anterior pre-SMA. In contrast to the posterior pre-SMA, the anterior pre-SMA is connected with most of the prefrontal but not somatomotor areas. Overall, the SMA is strongly connected to the thalamus and epithalamus, the posterior pre-SMA to putamen, pallidum, and STN and anterior pre-SMA to the caudate nucleus, with the caudate showing significant hemispheric asymmetry.

Functions

Penfield and Welch[18] in 1951 first described SMA in the monkey brain and the human brain as a representation of the body on the medial wall of the hemisphere. Woolsey and colleagues[19] in 1952 confirmed SMA in the monkey brain, describing it as a rough somatotopic map with the legs in a posterior location and the face in an anterior location. The representations of different body parts were found to overlap extensively. Stimulation of many sites evoked bilateral movements and sometimes movements of all four limbs. This overlapping somatotopic map in SMA was confirmed by many others.[2][13][20][21][22]

Four main hypotheses have been proposed for the function of SMA: the control of postural stability during stance or walking,[18] coordinating temporal sequences of actions,[23][24][25][26][27][28][29][30] bimanual coordination,[31][32] and the initiation of internally generated as opposed to stimulus driven movement.[3][29][30][33] The data, however, tend not to support an exclusive role of SMA in any one of these functions. Indeed, SMA is demonstrably active during non-sequential, unimanual, and stimulus-cued movements.[34]

In humans, the SMA has been shown to generate the early component of the Bereitschaftspotential (BP) or readiness potential BP1 or BPearly.[35] The role of the SMA was further substantiated by Cunnington et al. 2003,[36] showing that SMA proper and pre-SMA are active prior to volitional movement or action, as well as the cingulate motor area (CMA) and anterior mid-cingulate cortex (aMCC). Recently it has been shown by integrating simultaneously acquired EEG and fMRI that SMA and aMCC have strong reciprocal connections that act to sustain each other’s activity, and that this interaction is mediated during movement preparation according to the Bereitschaftspotential amplitude.[37]

SMA in the monkey brain may emphasize locomotion, especially complex locomotion such as climbing or leaping.[38][39][40] This suggestion was based on studies in which stimulation on a behaviorally relevant time scale evoked complex, full body movements that resembled climbing or leaping. This hypothesis is consistent with previous hypotheses, including the involvement of SMA in postural stabilization, in internally generated movements, in bimanual coordination, and in the planning of movement sequences, because all of these functions are heavily recruited in complex locomotion. The locomotion hypothesis is an example of interpreting the motor cortex in terms of the underlying behavioral repertoire from which abstract control functions emerge, an approach emphasized by Graziano and colleagues.[38]

Additional images

  • Supplementary motor cortex highlighted in green on coronal T1 MRI images
    Supplementary motor cortex highlighted in green on coronal T1 MRI images
  • Supplementary motor cortex highlighted in green on sagittal T1 MRI images
    Supplementary motor cortex highlighted in green on sagittal T1 MRI images
  • Supplementary motor cortex highlighted in green on transversal T1 MRI images
    Supplementary motor cortex highlighted in green on transversal T1 MRI images

References

  1. ^ a b He, S.Q., Dum, R.P. and Strick, P.L (1995). "Topographic organization of corticospinal projections from the frontal lobe: motor areas on the medial surface of the hemisphere". J. Neurosci. 15 (5): 3284–3306. doi:10.1523/JNEUROSCI.15-05-03284.1995. PMC 6578253. PMID 7538558.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  2. ^ a b Luppino, G., Matelli, M., Camarda, R.M., Gallese, V. and Rizzolatti, G (1991). "Multiple representations of body movements in mesial area 6 and the adjacent cingulate cortex: an intracortical microstimulation study in the macaque monkey". J. Comp. Neurol. 311 (4): 463–482. doi:10.1002/cne.903110403. PMID 1757598. S2CID 25297539.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. ^ a b Matsuzaka, Y., Aizawa, H., and Tanji, J (1992). "A motor area rostrao to the supplementary motor area (presupplementary motor area) in the monkey: neuronal activity during a learned motor task". J. Neurophysiol. 68 (3): 653–662. doi:10.1152/jn.1992.68.3.653. PMID 1432040.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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  5. ^ a b c Dum, R.P. & Strick, P.L (1991). "The origin of corticospinal projections from the premotor areas in the frontal lobe". J. Neurosci. 11 (3): 667–689. doi:10.1523/JNEUROSCI.11-03-00667.1991. PMC 6575356. PMID 1705965.
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  17. ^ Zhang, S., Ide, J.S., and Li, C.S. (2012). "Resting-State Functional Connectivity of the Medial Superior Frontal Cortex". Cereb. Cortex. 22 (1): 99–111. doi:10.1093/cercor/bhr088. PMC 3236794. PMID 21572088.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  18. ^ a b Penfield, W. & Welch, K (1951). "The supplementary motor area of the cerebral cortex: A clinical and experimental study". AMA Arch. Neurol. Psychiatry. 66 (3): 289–317. doi:10.1001/archneurpsyc.1951.02320090038004. PMID 14867993.
  19. ^ Woolsey, C.N., Settlage, P.H., Meyer, D.R., Sencer, W., Hamuy, T.P. and Travis, A.M. (1952). "Pattern of localization in precentral and "supplementary" motor areas and their relation to the concept of a premotor area". Association for Research in Nervous and Mental Disease. 30. New York, NY: Raven Press: 238–264.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  20. ^ Gould, H.J. III, Cusick, C.G., Pons, T.P. and Kaas, J.H (1996). "The relationship of corpus callosum connections to electrical stimulation maps of motor, supplementary motor, and the frontal eye fields in owl monkeys". J. Comp. Neurol. 247 (3): 297–325. doi:10.1002/cne.902470303. PMID 3722441. S2CID 21185898.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  21. ^ Muakkassa, K.F. & Strick, P.L (1979). "Frontal lobe inputs to primate motor cortex: evidence for four somatotopically organized 'premotor' areas". Brain Res. 177 (1): 176–182. doi:10.1016/0006-8993(79)90928-4. PMID 115545. S2CID 34047716.
  22. ^ Mitz, A.R. & Wise, S.P (1987). "The somatotopic organization of the supplementary motor area: intracortical microstimulation mapping". J. Neurosci. 7 (4): 1010–1021. doi:10.1523/JNEUROSCI.07-04-01010.1987. PMC 6568999. PMID 3572473.
  23. ^ Gaymard, B, Pierrot=Deseilligny, C. and Rivaud, S (1990). "Impairment of sequences of memory-guided saccades after supplementary motor area lesions". Annals of Neurology. 28 (5): 622–626. doi:10.1002/ana.410280504. PMID 2260848. S2CID 31214017.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  24. ^ Gerloff, C., Corwell, B., Chen, R., Hallett, M. and Cohen, L.G (1997). "Stimulation over the human supplementary motor area interferes with the organization of future elements in complex motor sequences". Brain. 120 (9): 1587–1602. doi:10.1093/brain/120.9.1587. PMID 9313642.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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  26. ^ Lee, D. & Quessy, S (2003). "Activity in the supplementary motor area related to learning and performance during a sequential visuomotor task". J. Neurophysiol. 89 (2): 1039–1056. doi:10.1152/jn.00638.2002. PMID 12574479.
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  37. ^ Nguyen VT, Breakspear M, Cunnington R (2014). "Reciprocal interactions of the SMA and cingulate cortex sustain pre-movement activity for voluntary actions". J Neurosci. 34 (49): 16397–16407. doi:10.1523/jneurosci.2571-14.2014. PMC 6608485. PMID 25471577.
  38. ^ a b Graziano, M.S.A. (2008). The Intelligent Movement Machine. Oxford, UK: Oxford University Press.
  39. ^ Graziano, M.S.A. and Aflalo, T.N. (2007). "Mapping behavioral repertoire onto the cortex" (PDF). Neuron. 56 (2): 239–251. doi:10.1016/j.neuron.2007.09.013. PMID 17964243.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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Further reading

  • Principles of Neural Science (2000), 4th ed., Kandel et al.
  • Debaere, F, Wenderoth, N, Sunaert, S, Van-Hecke, P, Swinnen, SP (Jul 2003). "Internal vs external generation of movements: differential neural pathways involved in bimanual coordination performed in the presence or absence of augmented visual feedback". NeuroImage. 19 (3): 764–76. doi:10.1016/s1053-8119(03)00148-4. PMID 12880805. S2CID 12977852.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  • Vorobiev; et al. (1998). "Parcellation of human mesial area 6: cytoarchitectonic evidence for three separate areas". Eur J Neurosci. 10 (6): 2199–203. doi:10.1046/j.1460-9568.1998.00236.x. PMID 9753106. S2CID 23787668.
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Pour les articles homonymes, voir Arrecifes. Cet article est une ébauche concernant l’Argentine. Vous pouvez partager vos connaissances en l’améliorant (comment ?) selon les recommandations des projets correspondants. Arrecifes Partido de Arrecifes Administration Pays Argentine Province Buenos Aires Capitale Arrecifes Fondée 1901 Maire Carlos Francisco Anguelini Code postal B2740 Code téléphone 02478 Statistiques IFAM IFAM Démographie Gentilé arrecifense Population 27 279...

1986–87 Celtic F.C. season

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources.Find sources: 1986–87 Celtic F.C. season – news · newspapers · books · scholar · JSTOR (May 2021) This articl...

Заболонь

Поперечный срез ствола тиса ягодного (Taxus baccata L.) Заболонь более светлая, расположена ближе к краю. За́болонь, или о́болонь, или блонь, или подко́рье, — наружные молодые, физиологически активные слои древесины стволов, ветвей и корней[1], примыкающие к образовате...

Harmony (color)

In color theory, color harmony refers to the property that certain aesthetically pleasing color combinations have. These combinations create pleasing contrasts and consonances that are said to be harmonious. These combinations can be of complementary colors, split-complementary colors, color triads, or analogous colors. Color harmony has been a topic of extensive study throughout history, but only since the Renaissance and the Scientific Revolution has it seen extensive codification. Artists ...

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