Abstract — Internal ultrastructure of the muscle tissue mitochondria of horsehair worm Gordionus alpestris (Nematomorpha) was studied using morphometry. Surface area of the inner mitochondrial membrane per unit of the mitochondrial volume, or surface density of the inner mitochondrial membrane, was measured as a main morphometric parameter. The surface density of the inner mitochondrial membrane of the G. alpestris muscle tissue was compared to the respective parameter of the skeletal and cardiac muscle mitochondria. The surface density of the inner mitochondrial membrane of the worm was close to the surface density values of the cardimyocytes of 3-month-old mice and Wistar rats and was slightly higher than the surface density of mitochondria from the skeletal muscle of 3-month-old mice. The functional significance of the well-developed system of mitochondrial membranes of extended mitochondria of the horsehair worm is discussed as a structure necessary to ensure effective functioning of the circomyarian conntractile apparatus in the muscle tissue of the horsehair worm.

中文翻译：

---

马毛虫 Gordionus alpestris (Nematomorpha) 肌肉组织线粒体内部超微结构的形态计量学分析

摘要 — 使用形态测量学研究了马毛蠕虫 Gordionus alpestris (Nematomorpha) 肌肉组织线粒体的内部超微结构。测量每单位线粒体体积的内线粒体膜的表面积，或内线粒体膜的表面密度，作为主要的形态测量参数。将 G. alpestris 肌肉组织的线粒体内膜的表面密度与骨骼肌和心肌线粒体的各自参数进行比较。线虫线粒体内膜表面密度接近3月龄小鼠和Wistar大鼠心肌细胞表面密度值，略高于3月龄骨骼肌线粒体表面密度-老老鼠。