The Real Role of Thumb in the Overall Function of Hand
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Abstract
The human thumb is a uniquely evolved anatomical structure that plays a disproportionately significant role in the overall function of the hand. While often taken for granted, the thumb’s opposability, mobility, and strength make it indispensable for grasp, manipulation, and precision tasks that distinguish human dexterity from other primates and animals. This perspective article examines the biomechanical, evolutionary, neurological, and functional significance of the thumb in hand activity. Beyond simple gripping, the thumb contributes to balance, stability, and refined motion in both gross and fine motor skills. It enables power grips essential for labor, sports, and survival, as well as precision grips vital for writing, surgery, and art. The discussion also considers the thumb’s role in neural representation, rehabilitation, and prosthetics, highlighting its irreplaceability in daily life. Ultimately, the thumb is not merely one of five digits but the cornerstone of human hand function, underpinning culture, technology, and survival.
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Thumb, Hand, Functionality, Technology, Ubiquity
No funding source declared.
Agarwal, P., Thatte, M. R., Saraf, M., Bobba, R., Sharma, D., & Dhakar, J. S. (2024). Normative values for thumb length in central Indian adult population. Indian Journal of Plastic Surgery, 57(04), 306–310. DOI: https://doi.org/10.1055/s-0044-1787871
Alshomrani, S., Aljoudi, L., & Arif, M. (2021). Arabic and American sign languages alphabet recognition by convolutional neural network. Advances in Science and Technology – Research Journal, 15(4), 136–148. DOI: https://doi.org/10.12913/22998624/142012
Andrés-Esperanza, J., Iserte-Vilar, J. L., Llop-Harillo, I., & Pérez-González, A. (2022). Effect of the thumb orientation and actuation on the functionality and performance of affordable prosthetic hands: Obtaining design criteria. Biomimetics, 7(4), 233. DOI: https://doi.org/10.3390/biomimetics7040233
Basnet, B., Singh, R. K., Parajuli, P. K., Suwal, P., Shrestha, P., & Baral, D. (2015). An anthropometric study to evaluate the correlation between the occlusal vertical dimension and length of the thumb. Clinical Cosmetic and Investigational Dentistry, 33. DOI: https://doi.org/10.2147/ccide.s75872
Colmers-Gray, I. N., Louison, H., & Kadar, A. (2025). Assessment and management of common hand fractures in adults. BMJ, e075436. DOI: https://doi.org/10.1136/bmj-2023-075436
Dennell, R., & Hurcombe, L. (2024). How and why is Homo sapiens so successful? Quaternary Environments and Humans, 2(2), 100006. DOI: https://doi.org/10.1016/j.qeh.2024.100006
Flatt, A. E. (2002). Our thumbs. Baylor University Medical Center Proceedings, 15(4), 380–387. DOI: https://doi.org/10.1080/08998280.2002.11927870
Harris, R., & De Jong, B. M. (2014). Cerebral activations related to Audition-Driven performance imagery in professional musicians. PLoS ONE, 9(4), e93681. DOI: https://doi.org/10.1371/journal.pone.0093681
Kivell, T. L. (2021). Human evolution: Thumbs up for efficiency. Current Biology, 31(6), R289–R291. DOI: https://doi.org/10.1016/j.cub.2021.02.021
Ladd, A. L. (2018). The Teleology of the Thumb: on purpose and design. The Journal of Hand Surgery, 43(3), 248–259. DOI: https://doi.org/10.1016/j.jhsa.2018.01.002
Lerebours, A., Marin, F., Bouvier, S., Egles, C., Rassineux, A., & Masquelet, A. (2020). Trends in Trapeziometacarpal Implant Design: A systematic survey based on patents and administrative databases. The Journal of Hand Surgery, 45(3), 223–238. DOI: https://doi.org/10.1016/j.jhsa.2019.11.015
Li, Z., & Goitz, R. J. (2003). Biomechanical evaluation of the motor function of the thumb. Technology and Health Care, 11(4), 233–243. DOI: https://doi.org/10.3233/thc-2003-11403
Marquardt, T. L., Nataraj, R., Evans, P. J., Seitz, W. H., & Li, Z. (2014). Carpal Tunnel syndrome impairs thumb opposition and circumduction motion. Clinical Orthopaedics and Related Research, 472(8), 2526–2533. DOI: https://doi.org/10.1007/s11999-014-3651-5
Ming, Z., Pietikainen, S., & Hänninen, O. (2006). Excessive texting in pathophysiology of first carpometacarpal joint arthritis. Pathophysiology, 13(4), 269–270. DOI: https://doi.org/10.1016/j.pathophys.2006.09.001
Muzaffar, A. R., Chao, J. J., & Freidrich, J. B. (2005). Posttraumatic thumb reconstruction. Plastic & Reconstructive Surgery, 116(5), 103e–122e. DOI: https://doi.org/10.1097/01.prs.0000182650.17230.2a
Nanayakkara, V. K., Cotugno, G., Vitzilaios, N., Venetsanos, D., Nanayakkara, T., & Sahinkaya, M. N. (2017). The Role of Morphology of the thumb in anthropomorphic grasping: a review. Frontiers in Mechanical Engineering, 3. DOI: https://doi.org/10.3389/fmech.2017.00005
Olafsdottir, H., Zatsiorsky, V. M., & Latash, M. L. (2004). Is the thumb a fifth finger? A study of digit interaction during force production tasks. Experimental Brain Research, 160(2), 203–213. DOI: https://doi.org/10.1007/s00221-004-2004-0
Quaine, F., Vigouroux, L., Paclet, F., & Colloud, F. (2010). The thumb during the crimp grip. International Journal of Sports Medicine, 32(01), 49–53. DOI: https://doi.org/10.1055/s-0030-1267230
Shafti, A., Haar, S., Mio, R., Guilleminot, P., & Faisal, A. A. (2021). Playing the piano with a robotic third thumb: assessing constraints of human augmentation. Scientific Reports, 11(1). DOI: https://doi.org/10.1038/s41598-021-00376-6
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