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Zur Entwicklung der Muskelspindeln in der menschlichen Zunge
Author(s) -
Kleiss Christina,
Kleiss Ekkehard
Publication year - 1980
Publication title -
anatomia, histologia, embryologia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.34
H-Index - 35
eISSN - 1439-0264
pISSN - 0340-2096
DOI - 10.1111/j.1439-0264.1980.tb00842.x
Subject(s) - tongue , anatomy , fetus , skull , genioglossus , biology , medicine , pathology , pregnancy , genetics
Abstract The presence, location and morphology of muscle spindles in the tongue of human fetuses and newborns was examined in frontal and sagittal serial sections of the organ or of the whole lower half of the mouth. While in the fetal material of 105, 155 and 170 mrn. C. R. L. there are only very few and small spindles in some extrinsic muscles of the tongue and in the Mm. mylohyoideus and geniohyoideus, the specimens of 260, 310 and 390mm. C. R. L. showed them in the intrinsic muscles as well as in the extrinsic ones, excludicg only the region of the tip of the tongue. In the latter group, the size of the whole spindles is bigger than in the small fetuses, and their number increases towards the root and the midline area of the tongue. In the newborns, there is the same situation in general, with an especially high number of spindles in the Mm. transversus linguae and genioglossus. The size of the intrafusal muscle fibers was of 6.33 ± 0.72µm. in the newborns, and of 4.93 ± 1.16 pm. in the fetal material; the sheat (capsule) is thinner and the periaxi.11 space is smaller in the minor specimens. As it was possible to find spindles in the muscles of the floor of the mouth in a fetus of the 4th lunar month, there seems to be evidence of the earlier appearance of sum proprioceptors in this region than in other parts of the body, an observation which might implicate some functional significance.