Muscle fibre types of the lumbrical, interossei, flexor, and extensor muscles moving the index finger.

Title
Muscle fibre types of the lumbrical, interossei, flexor, and extensor muscles moving the index finger.
Authors
황건
Keywords
Muscle fibres, fast-twitch, fingers
Issue Date
2013
Publisher
JOURNAL OF PLASTIC SURGERY AND HAND SURGERY
Series/Report no.
JOURNAL OF PLASTIC SURGERY AND HAND SURGERY ; Vol.47 no.4 Startpage 268 Endpage 272
Abstract
The aim of this study was to determine the fibre types of the muscles moving the index fingers in humans. Fifteen forearms of eight adult cadavers were used. The sampled muscles were the first lumbrical (LM), first volar interosseous (VI), first dorsal interosseus (DI), second flexor digitorum profundus (FDP), second flexor digitorum superficialis (FDS), and extensor digitorum (ED). Six micrometer thick sections were stained for fast muscle fibres. The procedure was performed by applying mouse monoclonal anti-skeletal myosin antibody (fast) and avidin-biotin peroxidase complex staining. Rectangular areas (0.38 mm 0.38 mm) were photographed and the boundaries of the muscle areas were marked on the translucent film. The numbers and sizes of the muscle fibres in each part were evaluated by the image analyser program and calculated per unit area (1 mm2 ). The proportion of the fast fibres was significantly (p = 0.012) greater in the intrinsic muscles (55.7 ± 17.1%) than in the extrinsic muscles (45.9 ± 17.1%). Among the six muscles, the VI had a significantly higher portion (59.3%) of fast fibres than the FDS (40.6%) (p = 0.005) or the FDP (45.1%) (p = 0.023). The density of the non-fast fibres was significantly (p = 0.015) greater in the extrinsic muscles (539.2 ± 336.8/mm2 ) than in the intrinsic muscles (383.4 ± 230.4/mm2 ). Since the non-fast fibres represent less fatigable fibres, it is thought that the extrinsic muscles have higher durability against fatigue, and the intrinsic muscles, including the LM, should move faster than the FDS or FDP because the MP joint should be flexed before the IP joint to grip an object.
URI
http://dspace.inha.ac.kr/handle/10505/31638
ISSN
0364-216X
Appears in Collections:
Medical School/College of Medicine (의학전문대학원/의과대학) > Medical Science (의학) > Journal Papers, Reports(의학 논문, 보고서)

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