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[Distribution of the muscle spindles in human masticatory muscles].

AbstractOBJECTIVE:
To investigate the characteristics in the topographic distribution of the muscle spindles in human masticatory muscles.
METHODS:
The muscle spindles of the masticatory muscles on both sides of 3 human corpses fixed in formalin for more than 1 year were observed histologically and analyzed quantitatively using an image analysis system.
RESULTS:
The mean muscle spindle density was 32.11/g in the masseter, significantly higher in the deep muscular fibers (70.76/g) with high proportion of spindle complexes than in the superficial layers of the muscle belly (P<0.05). The mean spindle density in the temporalis was 5.44/g, higher in the anterior portion (7.44/g) than in the posterior portion (3.78/g, P<0.01). The medial pterygoid had a mean spindle density of 4.43/g.
CONCLUSION:
These results indicate a heterogeneous distribution of muscle spindles in the masticatory muscles with different morphologies or in different portions of the same muscle, depending on muscle fiber type and muscular architecture.
AuthorsYue-rong Zhang, Jing Liu
JournalNan fang yi ke da xue xue bao = Journal of Southern Medical University (Nan Fang Yi Ke Da Xue Xue Bao) Vol. 29 Issue 9 Pg. 1820-2 (Sep 2009) ISSN: 1673-4254 [Print] China
PMID19778800 (Publication Type: English Abstract, Journal Article, Research Support, Non-U.S. Gov't)
Topics
  • Humans
  • Masticatory Muscles (innervation, physiology)
  • Muscle Spindles (anatomy & histology, physiology)

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