The density of muscle spindles in the medial, intermediate and lateral columns of human intrinsic postvertebral muscles.
AUTOR(ES)
Amonoo-Kuofi, H S
RESUMO
The area occupied by the intrinsic postvertebral muscles varies in the different region of the back. This is associated with variations in the densities of muscle spindles in successive segments of the three columns of muscle. In the thoracic region, the lateral column has the highest density of spindles, whilst the intermediate and medial columns have steadily less. The attachment of iliocostalis and longissimus thoracis muscles to the ribs is such that contraction of these muscles can produce changes in the costotransverse joints. Conversely, movement in these joints might stimulate stretch receptors in the postvertebral muscles. There is collateral innervation of the costotransverse joints and the postvertebral muscles of the thoracic region by the posterior ramus. The finding of high densities of spindles in the thoracic region would therefore seem to support the hypothesis that these muscles probably monitor postural activity of the back as well as the rib cage.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1171897Documentos Relacionados
- The number and distribution of muscle spindles in human intrinsic postvertebral muscles.
- The sensory and motor innervation of muscle spindles in cat tail dorsolateral muscles.
- Muscle spindles in human laryngeal muscles
- Distribution, density and size of muscle receptors in cat tail dorsolateral muscles.
- The number, distribution and density of muscle spindles in two wing muscles of the domestic duck.