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Original Paper

Architectural and Histochemical Properties of Cat Hip ‘Cuff’ Muscles

Roy R.R. · Kim J.A. · Monti R.J. · Zhong H. · Edgerton V.R.

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Brain Research Institute and Physiological Science Department, University of California, Los Angeles, Los Angeles, Calif., USA

Related Articles for ""

Acta Anatomica 1997;159:136–146

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: July 18, 2008
Issue release date: 1997

Number of Print Pages: 11
Number of Figures: 0
Number of Tables: 0

ISSN: 1422-6405 (Print)
eISSN: 1422-6421 (Online)

For additional information: https://www.karger.com/CTO

Abstract

The architectural properties and fiber-type composition of the cat hip ‘cuff’ muscles, i.e. the deep layer of muscles encircling the hip joint, were determined. The muscles studied included the gluteus minimus, obturator internus and externus, gemellus superior and inferior, pyriformis, quadratus femoris and capsularis. In addition, the fiber-type composition was determined for the iliacus muscle. Compared to other lower limb muscles, the cuff muscles were small (–0.2 to 2.7 g) and short (–15 to 40 mm long) and had short mean fiber lengths (–7 to 12 mm long), small angles of fiber pinnation (< 12°), and small physiological cross-sectional areas (–0.2 to 2.8 cm2). The percentage of the cross-sectional area comprised of slow fibers ranged from 24 to 95% with this value being over 50% in 5/9 muscles studied. The small angle of pinnation and short fiber lengths optimize force production and the relatively high percentage of slow fibers suggest a high level of activation. Both of these properties are consistent with a hip stabilization role for these muscles. In addition, the high percentage of slow fibers suggests a high spindle density and a possible role of these muscles in providing proprioceptive feedback to the central nervous system for the control of posture and locomotion.

© 1997 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: July 18, 2008
Issue release date: 1997

Number of Print Pages: 11
Number of Figures: 0
Number of Tables: 0

ISSN: 1422-6405 (Print)
eISSN: 1422-6421 (Online)

For additional information: https://www.karger.com/CTO


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