小鱼际肌肌内神经和肌梭密度分布

Distribution of intramuscular nerve and muscle spindles density in hypothenar of human

目的揭示小鱼际肌肌内神经和肌梭密度的分布规律。方法对成年20具尸体(40例)小鱼际标本用改良Sihler肌内神经染色法和苏木精-伊红(HE)染色法。结果小鱼际肌肌外神经干长0.49～1.64 cm,从肌起端深面入肌。小指展肌内尺侧和桡侧有独立的神经支配,可分为两个神经肌亚部;小指短屈肌的肌内神经干斜行穿越肌实质中央;小指对掌肌内神经吻合形式多样,"U"型吻合更明显。3块肌的桡侧部神经分支分布密集。小指对掌肌肌梭密度最高为(19.33±2.72)个/g;小指短屈肌其次,有(15.79±1.33)个/g;小指展肌最少,为(12.86±1.69)个/g。结论三块肌桡侧部更多地参与精细调节;肌块越小,肌梭密度越高。

Objective To reveal the distribution regular pattern of intramuscular nerve branches and muscle spindle density of the hypothenar.Methods Modified Sihler staining,Hematoxylin and Eosin staining were used.Results The extramuscular nerve entered each muscle from its deep surface at the origination of the hypothenar muscles,and the mean extramuscular nerve trunk length ranged between 0.49-1.64 cm.There were independent innervation in ulnar and radial part of the abductor digiti minimi that could be divided into two nerve compartments.The intramuscular nerve trunk of flexor digiti minimi brevis passed obliquely through central region of muscle.Diverse nerve anastomoses pattern were observed in the opponens digiti minimi,especially,＂U-like＂ was more obvious.Intensive branches of intramuscular nerves to be situated in radial of the three muscles.Muscle spindle density of the opponens digiti minimi was most highest [（19.33±2.72）/]g,flexor digiti minimi brevis was next,that was（15.79±1.33）/g,and the lowest was abductor digiti minimi [（12.86±1.69）/g].Conclusion Radial part of the three muscles participated in fine regulation more than ulnar;If the muscle was more small,the muscle spindle density was more high.