Year :
2021
| Month :
October
| Volume :
15
| Issue :
10
| Page :
AL01 -
Full Version
Letter to the Editor: Presence of Supernumerary First Dorsal Interossei Muscle
Published: October 1, 2021 | DOI: https://doi.org/10.7860/JCDR/2021/51052.15454
Debra Kusnierek
1. Occupational Therapy Doctoral Student (OTDS), Department of Occupational Therapy Doctoral Program, Huntington University, Fort Wayne, Indiana, USA.
Correspondence Address :
Debra Kusnierek,
91 East Sidlee Street, Thousand Oaks, California, USA.
E-mail: kusnierekd@huntington.edu
Keywords
Cadaveric study, Dorsal interosseous, Metacarpal bone, Radial side, Ulnar side
Introduction
Dear Editor, In the June 2016 issue of this Journal, Nayak VS et al., (1) published, “Cadaveric Study on Morphology of Dorsal Interossei of Hand and its Anatomical Variation”. Three out of the 30 dissected hands had a supernumerary muscle originating from the third metatarsal. During the dissection within the Occupational Therapy Program at Huntington University in Fort Wayne, Indiana, the author identified a supernumerary first left Dorsal Interossei Muscle (DIM) [Table/ Fig-1]. The unusual variation could not be identified on the right upper extremity. This variant should thus be added to the one by Nayak VS et al., (1).
Masquelet AC et al., stated that the superficial head of the first DIM primarily causes abduction, whereas the deep head causes thumb and index finger flexion to form a pinch (2). The DIMs of the hand also act as stabilisers for the fingers during grasping and manipulation (3). The accessory head which the author identified will most likely to provide an increase in pinch strength, which is important for manual exploration of an object, along with identification. Fine motor skills can orient an object, stabilise it, and transfer it to a desired location (4). Susman RL et al., analysed the potential functional purpose of musculus accessories interosseus, a unique muscle found in lesser apes that originates from the second metacarpal and inserts distally into the extensor assembly; they suggested that it evolved to compensate for the deep cleft found between the thumb and index finger in lesser apes (5). Results of Susman RL et al., Electromyogram (EMG) analysis showed that the accessorius interosseus functions mainly to abduct the index finger during pinching and grasping of objects (6). The supernumerary first DIM, we identified may function in a similar manner for humans.
Reference
| 1. | Nayak VS, Priya A, Bhat N, Nayak SS, D’Souza AS, Bangera H, et al. Cadaveric study on morphology of dorsal interossei of hand and its anatomical variation. J Clin Diagn Res: JCDR. 2016;10(6):AC04-06. https://doi.org/10.7860/ JCDR/2016/19068.8034
| 2. | Masquelet AC, Salama J, Outrequin G, Serrault M, Chevrel JP. Morphology and functional anatomy of the first dorsal interosseous muscle of the hand. Surgical and Radiological Anatomy. 1986;8(1):19-28.
| 3. | Bharambe VK, Shevde SP, Puranam V, Kanaskar NS. Additional heads of dorsal interosseous muscle in Caucasian cadavers and their clinical significance. Sahel Medical Journal. 2013;16(4):174-77.
| 4. | Kimmerle M, Mainwaring L, Borenstein M. The functional repertoire of the hand and its application to assessment. American Journal of Occupational Therapy. 2003;57(5):489-98. https://doi.org/10.5014/ajot.57.5.489
| 5. | Susman RL, Jungers WL, Stern JT Jr. The functional morphology of the accessory interosseous muscle in the gibbon hand: determination of locomotor and manipulatory compromises. Journal of Anatomy. 1982;134(1):111-20. |
10.7860/JCDR/2021/51052.15454
Date of Submission: Jun 25, 2021
Date of Peer Review: Aug 13, 2021
Date of Acceptance: Aug 23, 2021
Date of Publishing: Oct 01, 2021
AUTHOR DECLARATION:
• Financial or Other Competing Interests: None
• Was informed consent obtained from the subjects involved in the study? NA
• For any images presented appropriate consent has been obtained from the subjects. NA
PLAGIARISM CHECKING METHODS:
• Plagiarism X-checker: Jun 28, 2021
• Manual Googling: Aug 21, 2021
• iThenticate Software: Sep 02, 2021 (12%)
ETYMOLOGY: Author Origin
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