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Novel findings on ultrastructural protection of skeletal muscle fibers during hibernation of Daurian ground squirrels: Mitochondria, nuclei, cytoskeleton, glycogen.
J Cell Physiol
August 2019
Physiology Unit, Otto Loewi Research Center for Vascular Biology, Immunology and Inflammation, Medical University of Graz, Graz, Austria.
We examined ultrastructure protective phenomena and mechanisms of slow and fast muscles in hibernating Daurian ground squirrels (Spermophilus dauricus). Some degenerative changes such as slightly decreased sarcomere length and vacuolization occurred in hibernation, but periaxonal capsular borders in intrafusal fibers remained distinct and the arrangement of extrafusal fibers and Z-lines unscathed. In soleus samples, the number of glycogenosomes more than tripled during hibernation.
View Article and Find Full Text PDF[Ultrastructural alteration of extraocular muscle proprioceptor in congenital idiopathic nystagmus].
Zhonghua Yan Ke Za Zhi
February 2017
National Key Discipline of Pediatrics, Ministry of Education, Department of Ophthalmology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
To explore the ultrastructural alteration of extraocular muscle proprioceptor in congenital idiopathic nystagmus (CIN). Case-control study. Ten extraocular muscle samples were collected from five CIN children who underwent nystagmus surgeries in Beijing Children's Hospital from March 2015 to March 2016.
View Article and Find Full Text PDFFibre typing of intrafusal fibres.
J Anat
August 2015
Department of Integrative Medical Biology, Laboratory of Muscle Biology, Umeå University, Umeå, Sweden.
The first descriptions of muscle spindles with intrafusal fibres containing striated myofibrils and nervous elements were given approximately 150 years ago. It took, however, another 100 years to establish the presence of two types of intrafusal muscle fibres: nuclear bag and nuclear chain fibres. The present paper highlights primarily the contribution of Robert Banks in fibre typing of intrafusal fibres: the confirmation of the principle of two types of nuclear bag fibres in mammalian spindles and the variation in occurrence of a dense M-band along the fibres.
View Article and Find Full Text PDF[Morphological characteristic of a motor unit afferent limb in hypokinesia].
Morfologiia
September 2014
Neuromuscular spindles (NMS) of soleus muscle and their vascular bed was studied in 250 mature male Wistar rats following long-term (30, 60, 120 and 240 days) hypokinesia. Material was studied using Kulchitsky, Mason and Ranson histological staining, electron microscopic and histochemical methods (demonstration of succinate dehydrogenase). It was found that initial changes involved the decrease of the lumen of precapillary arterioles (by 25.
View Article and Find Full Text PDFAnalyses of muscle spindles in the soleus of six inbred mouse strains.
J Anat
September 2013
School of Medical Sciences, University of Aberdeen, Aberdeen, UK.
Adult muscle size and fibre-type composition are heritable traits that vary substantially between individuals. We used inbred mouse strains in which soleus muscle mass varied by an order of magnitude to explore whether properties of muscle spindles can also be influenced by genetic factors. Skip-serial cross-sections of soleus muscles dissected from 15 male mice of BEH, BEL, C57BL/6J, DUH, LG/J and SM/J strains were analysed for number of muscle spindles and characteristics of intrafusal and extrafusal fibres following ATPase staining.
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