Marked non-uniformity of fiber-type composition in the primate suboccipital muscle obliquus capitis inferior
| Autor: | Brian D. Corneil, Frances J. R. Richmond, Kan Singh |
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| Rok vydání: | 1999 |
| Předmět: |
Male
Posture Muscle spindle Inferior oblique muscle Neck Muscles Perimysial biology.animal medicine Obliquus capitis inferior Animals Primate Cervical Atlas Axis Cervical Vertebra Fiber type composition Adenosine Triphosphatases biology Chemistry General Neuroscience Anatomy Macaca mulatta Cell Compartmentation Muscle Fibers Slow-Twitch medicine.anatomical_structure Suboccipital muscle Head Movements Occipital Bone Female medicine.symptom Muscle Contraction Muscle contraction |
| Zdroj: | Experimental Brain Research. 125:14-18 |
| ISSN: | 1432-1106 0014-4819 |
| Popis: | Obliquus capitis inferior (OCI) is a monoarticular suboccipital muscle linking the transverse process of the atlas (C1) to the spinous process of the axis (C2). Histochemical analysis of fiber-type composition showed that the muscle has a marked gradient of fiber-type distribution in which type I fibers comprise 95-100% of fibers in the deepest region but less than 10% of fibers in the superficial layer. Step-like changes in fiber-type proportions occurred between groups of fascicles. In most instances the boundaries between these fascicles did not exhibit different perimysial features from those fascicles with similar fiber-type proportions. OCI contained large numbers of muscle spindles, which were concentrated in deep regions rich in type I fibers. The degree of nonuniformity in fiber-type distribution seen in OCI is unusually large when compared with patterns described in other primate muscles, and has implications for the way that the muscle is studied anatomically and physiologically. |
| Databáze: | OpenAIRE |
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