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Anatomy of raccoon ( Procyon lotor ) and coati ( Nasua narica and N. nasua ) forearm and leg muscles: Relations between fiber length, moment‐arm length, and joint‐angle excursion
Author(s) -
McClearn Deedra
Publication year - 1985
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051830106
Subject(s) - excursion , anatomy , biology , muscle architecture , muscle fibre , fiber , forearm , joint (building) , moment (physics) , skeletal muscle , physics , materials science , architectural engineering , classical mechanics , political science , law , engineering , composite material
Muscle architecture, moment arms, and locomotor movements in the distal limb segments of the procyonids Nasua (coati) and Procyon (raccoon) are analyzed with reference to patterns of muscle fiber length. This study addresses the hypothesis that relative fiber lengths among muscles in a muscle group can be predicted on the basis of correlates of muscle tension. The results include the following: (1) consistent patterns of fiber length of muscles in a muscle group exist within and between the two genera. (2) Differences in fiber length between muscles can be accounted for by two principal correlates of muscle excursion—length of a muscle's moment arm about a joint and jointangle excursion. (3) Muscle fiber pinnation permits increased tendon excursion, but this effect is relatively small in comparison to the effects of moment‐arm length and joint‐angle excursion. (4) Corollary action between two or more joints (or lack thereof) is an important factor in determination of fiber lengths.